161105490 has 256 divisors, whose sum is σ = 541900800. Its totient is φ = 33156864.

The previous prime is 161105479. The next prime is 161105491. The reversal of 161105490 is 94501161.

161105490 is a `hidden beast` number, since 1 + 6 + 110 + 549 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161105491) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1940989 + ... + 1941071.

It is an arithmetic number, because the mean of its divisors is an integer number (2116800).

Almost surely, 2^161105490 is an apocalyptic number.

161105490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161105490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270950400).

161105490 is an abundant number, since it is smaller than the sum of its proper divisors (380795310).

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

161105490 is a wasteful number, since it uses less digits than its factorization.

161105490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 161105490 is about 12692.7337480938. The cubic root of 161105490 is about 544.1309720153.

The spelling of 161105490 in words is "one hundred sixty-one million, one hundred five thousand, four hundred ninety".