161531675 has 24 divisors (see below), whose sum is σ = 205976400. Its totient is φ = 125614080.

The previous prime is 161531663. The next prime is 161531701. The reversal of 161531675 is 576135161.

It is not a de Polignac number, because 161531675 - 2²² = 157337371 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 142511 + ... + 143639.

It is an arithmetic number, because the mean of its divisors is an integer number (8582350).

Almost surely, 2^161531675 is an apocalyptic number.

161531675 is a deficient number, since it is larger than the sum of its proper divisors (44444725).

161531675 is a wasteful number, since it uses less digits than its factorization.

161531675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295 (or 1290 counting only the distinct ones).

The product of its digits is 18900, while the sum is 35.

The square root of 161531675 is about 12709.5112022453. The cubic root of 161531675 is about 544.6103603344.

The spelling of 161531675 in words is "one hundred sixty-one million, five hundred thirty-one thousand, six hundred seventy-five".