161931952 has 40 divisors (see below), whose sum is σ = 386148896. Its totient is φ = 64060416.

The previous prime is 161931949. The next prime is 161931961. The reversal of 161931952 is 259139161.

It is a happy 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, 54153 + ... + 57064.

Almost surely, 2^161931952 is an apocalyptic number.

It is an amenable number.

161931952 is an abundant number, since it is smaller than the sum of its proper divisors (224216944).

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

161931952 is a wasteful number, since it uses less digits than its factorization.

161931952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111245 (or 111239 counting only the distinct ones).

The product of its digits is 14580, while the sum is 37.

The square root of 161931952 is about 12725.2486026796. The cubic root of 161931952 is about 545.0598391216.

It can be divided in two parts, 16193 and 1952, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 161931952 in words is "one hundred sixty-one million, nine hundred thirty-one thousand, nine hundred fifty-two".