161874513 has 6 divisors (see below), whose sum is σ = 233818754. Its totient is φ = 107916336.

The previous prime is 161874511. The next prime is 161874539. The reversal of 161874513 is 315478161.

161874513 is a `hidden beast` number, since 1 + 61 + 87 + 4 + 513 = 666.

It can be written as a sum of positive squares in only one way, i.e., 122146704 + 39727809 = 11052^2 + 6303^2 .

It is not a de Polignac number, because 161874513 - 2¹ = 161874511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161874511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8993020 + ... + 8993037.

Almost surely, 2^161874513 is an apocalyptic number.

It is an amenable number.

161874513 is a deficient number, since it is larger than the sum of its proper divisors (71944241).

161874513 is a wasteful number, since it uses less digits than its factorization.

161874513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17986063 (or 17986060 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 161874513 is about 12722.9915114332. The cubic root of 161874513 is about 544.9953853101.

The spelling of 161874513 in words is "one hundred sixty-one million, eight hundred seventy-four thousand, five hundred thirteen".