161381574 has 12 divisors (see below), whose sum is σ = 349660116. Its totient is φ = 53793852.

The previous prime is 161381569. The next prime is 161381609. The reversal of 161381574 is 475183161.

161381574 is a `hidden beast` number, since 1 + 6 + 1 + 3 + 81 + 574 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4482804 + ... + 4482839.

It is an arithmetic number, because the mean of its divisors is an integer number (29138343).

Almost surely, 2^161381574 is an apocalyptic number.

161381574 is an abundant number, since it is smaller than the sum of its proper divisors (188278542).

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

161381574 is a wasteful number, since it uses less digits than its factorization.

161381574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8965651 (or 8965648 counting only the distinct ones).

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

The square root of 161381574 is about 12703.6047640030. The cubic root of 161381574 is about 544.4416175922.

The spelling of 161381574 in words is "one hundred sixty-one million, three hundred eighty-one thousand, five hundred seventy-four".