161535172 has 24 divisors (see below), whose sum is σ = 293110272. Its totient is φ = 77812800.

The previous prime is 161535161. The next prime is 161535197. The reversal of 161535172 is 271535161.

It is a super-2 number, since 2×161535172² = 52187223586139168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

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, 26097 + ... + 31687.

It is an arithmetic number, because the mean of its divisors is an integer number (12212928).

Almost surely, 2^161535172 is an apocalyptic number.

It is an amenable number.

161535172 is a deficient number, since it is larger than the sum of its proper divisors (131575100).

161535172 is a wasteful number, since it uses less digits than its factorization.

161535172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5859 (or 5857 counting only the distinct ones).

The product of its digits is 6300, while the sum is 31.

The square root of 161535172 is about 12709.6487756350. The cubic root of 161535172 is about 544.6142903968.

The spelling of 161535172 in words is "one hundred sixty-one million, five hundred thirty-five thousand, one hundred seventy-two".