161237956 has 12 divisors (see below), whose sum is σ = 307818000. Its totient is φ = 73289960.

The previous prime is 161237939. The next prime is 161237963. The reversal of 161237956 is 659732161.

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, 1832206 + ... + 1832293.

It is an arithmetic number, because the mean of its divisors is an integer number (25651500).

Almost surely, 2^161237956 is an apocalyptic number.

It is an amenable number.

161237956 is a deficient number, since it is larger than the sum of its proper divisors (146580044).

161237956 is a wasteful number, since it uses less digits than its factorization.

161237956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3664514 (or 3664512 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The square root of 161237956 is about 12697.9508583078. The cubic root of 161237956 is about 544.2800650251.

The spelling of 161237956 in words is "one hundred sixty-one million, two hundred thirty-seven thousand, nine hundred fifty-six".