161099136 has 96 divisors (see below), whose sum is σ = 505762920. Its totient is φ = 48814080.

The previous prime is 161099131. The next prime is 161099137. The reversal of 161099136 is 631990161.

161099136 is a `hidden beast` number, since 1 + 610 + 9 + 9 + 1 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161099136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161099131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6316 + ... + 19028.

Almost surely, 2^161099136 is an apocalyptic number.

161099136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161099136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252881460).

161099136 is an abundant number, since it is smaller than the sum of its proper divisors (344663784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161099136 is a wasteful number, since it uses less digits than its factorization.

161099136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12744 (or 12729 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 161099136 is about 12692.4834449370. The cubic root of 161099136 is about 544.1238184133.

The spelling of 161099136 in words is "one hundred sixty-one million, ninety-nine thousand, one hundred thirty-six".