161572232 has 8 divisors (see below), whose sum is σ = 302947950. Its totient is φ = 80786112.

The previous prime is 161572211. The next prime is 161572237. The reversal of 161572232 is 232275161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 130279396 + 31292836 = 11414^2 + 5594^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×161572232² = 52211172306923648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161572195 and 161572204.

It is not an unprimeable number, because it can be changed into a prime (161572237) 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 as a sum of consecutive naturals, namely, 10098257 + ... + 10098272.

Almost surely, 2^161572232 is an apocalyptic number.

It is an amenable number.

161572232 is a deficient number, since it is larger than the sum of its proper divisors (141375718).

161572232 is a wasteful number, since it uses less digits than its factorization.

161572232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20196535 (or 20196531 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 161572232 is about 12711.1066394709. The cubic root of 161572232 is about 544.6559363575.

The spelling of 161572232 in words is "one hundred sixty-one million, five hundred seventy-two thousand, two hundred thirty-two".