32161538 has 4 divisors (see below), whose sum is σ = 48242310. Its totient is φ = 16080768.

The previous prime is 32161523. The next prime is 32161543. The reversal of 32161538 is 83516123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 23203489 + 8958049 = 4817^2 + 2993^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 32161538.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8040383 + ... + 8040386.

Almost surely, 2^32161538 is an apocalyptic number.

32161538 is a deficient number, since it is larger than the sum of its proper divisors (16080772).

32161538 is a wasteful number, since it uses less digits than its factorization.

32161538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16080771.

The product of its digits is 4320, while the sum is 29.

The square root of 32161538 is about 5671.1143525766. The cubic root of 32161538 is about 318.0135339624.

The spelling of 32161538 in words is "thirty-two million, one hundred sixty-one thousand, five hundred thirty-eight".