161255136 has 48 divisors (see below), whose sum is σ = 483767424. Its totient is φ = 46072704.

The previous prime is 161255123. The next prime is 161255141. The reversal of 161255136 is 631552161.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119310 + ... + 120653.

It is an arithmetic number, because the mean of its divisors is an integer number (10078488).

Almost surely, 2^161255136 is an apocalyptic number.

161255136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161255136 is an abundant number, since it is smaller than the sum of its proper divisors (322512288).

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

161255136 is a wasteful number, since it uses less digits than its factorization.

161255136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239983 (or 239975 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 161255136 is about 12698.6273273925. The cubic root of 161255136 is about 544.2993954600.

The spelling of 161255136 in words is "one hundred sixty-one million, two hundred fifty-five thousand, one hundred thirty-six".