161804936 has 8 divisors (see below), whose sum is σ = 303384270. Its totient is φ = 80902464.

The previous prime is 161804927. The next prime is 161804947. The reversal of 161804936 is 639408161.

It can be written as a sum of positive squares in only one way, i.e., 153908836 + 7896100 = 12406^2 + 2810^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 161804936.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10112801 + ... + 10112816.

Almost surely, 2^161804936 is an apocalyptic number.

It is an amenable number.

161804936 is a deficient number, since it is larger than the sum of its proper divisors (141579334).

161804936 is a wasteful number, since it uses less digits than its factorization.

161804936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20225623 (or 20225619 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 161804936 is about 12720.2569156444. The cubic root of 161804936 is about 544.9172907060.

The spelling of 161804936 in words is "one hundred sixty-one million, eight hundred four thousand, nine hundred thirty-six".