161597156 has 12 divisors (see below), whose sum is σ = 323194368. Its totient is φ = 69255912.

The previous prime is 161597143. The next prime is 161597197. The reversal of 161597156 is 651795161.

161597156 is an admirable number.

It is a super-2 number, since 2×161597156² = 52227281654576672, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 2885636 + ... + 2885691.

It is an arithmetic number, because the mean of its divisors is an integer number (26932864).

Almost surely, 2^161597156 is an apocalyptic number.

It is an amenable number.

161597156 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161597156 is a wasteful number, since it uses less digits than its factorization.

161597156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5771338 (or 5771336 counting only the distinct ones).

The product of its digits is 56700, while the sum is 41.

The square root of 161597156 is about 12712.0870041075. The cubic root of 161597156 is about 544.6839409769.

The spelling of 161597156 in words is "one hundred sixty-one million, five hundred ninety-seven thousand, one hundred fifty-six".