161871774 has 16 divisors (see below), whose sum is σ = 325372800. Its totient is φ = 53685720.

The previous prime is 161871767. The next prime is 161871793. The reversal of 161871774 is 477178161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66592 + ... + 68979.

It is an arithmetic number, because the mean of its divisors is an integer number (20335800).

Almost surely, 2^161871774 is an apocalyptic number.

161871774 is an abundant number, since it is smaller than the sum of its proper divisors (163501026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161871774 is a wasteful number, since it uses less digits than its factorization.

161871774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135775.

The product of its digits is 65856, while the sum is 42.

The square root of 161871774 is about 12722.8838711984. The cubic root of 161871774 is about 544.9923114254.

The spelling of 161871774 in words is "one hundred sixty-one million, eight hundred seventy-one thousand, seven hundred seventy-four".