161874836 has 12 divisors (see below), whose sum is σ = 284188212. Its totient is φ = 80678208.

The previous prime is 161874829. The next prime is 161874841. The reversal of 161874836 is 638478161.

It can be written as a sum of positive squares in 2 ways, for example, as 21215236 + 140659600 = 4606^2 + 11860^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 63395 + ... + 65898.

It is an arithmetic number, because the mean of its divisors is an integer number (23682351).

Almost surely, 2^161874836 is an apocalyptic number.

It is an amenable number.

161874836 is a deficient number, since it is larger than the sum of its proper divisors (122313376).

161874836 is a wasteful number, since it uses less digits than its factorization.

161874836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129610 (or 129608 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 161874836 is about 12723.0042049824. The cubic root of 161874836 is about 544.9957477995.

The spelling of 161874836 in words is "one hundred sixty-one million, eight hundred seventy-four thousand, eight hundred thirty-six".