161596961 has 8 divisors (see below), whose sum is σ = 169461480. Its totient is φ = 153885312.

The previous prime is 161596943. The next prime is 161596973. The reversal of 161596961 is 169695161.

It can be written as a sum of positive squares in 4 ways, for example, as 13366336 + 148230625 = 3656^2 + 12175^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161596961 is a prime.

It is a super-2 number, since 2×161596961² = 52227155608871042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161596921) 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 7 ways as a sum of consecutive naturals, for example, 36050 + ... + 40283.

It is an arithmetic number, because the mean of its divisors is an integer number (21182685).

Almost surely, 2^161596961 is an apocalyptic number.

It is an amenable number.

161596961 is a deficient number, since it is larger than the sum of its proper divisors (7864519).

161596961 is an equidigital number, since it uses as much as digits as its factorization.

161596961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76435.

The product of its digits is 87480, while the sum is 44.

The square root of 161596961 is about 12712.0793342395. The cubic root of 161596961 is about 544.6837218860.

The spelling of 161596961 in words is "one hundred sixty-one million, five hundred ninety-six thousand, nine hundred sixty-one".