161371772 has 24 divisors (see below), whose sum is σ = 296822400. Its totient is φ = 76616496.

The previous prime is 161371759. The next prime is 161371783. The reversal of 161371772 is 277173161.

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, 6479 + ... + 19097.

It is an arithmetic number, because the mean of its divisors is an integer number (12367600).

Almost surely, 2^161371772 is an apocalyptic number.

It is an amenable number.

161371772 is a deficient number, since it is larger than the sum of its proper divisors (135450628).

161371772 is a wasteful number, since it uses less digits than its factorization.

161371772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12785 (or 12783 counting only the distinct ones).

The product of its digits is 12348, while the sum is 35.

The square root of 161371772 is about 12703.2189621371. The cubic root of 161371772 is about 544.4305945973.

The spelling of 161371772 in words is "one hundred sixty-one million, three hundred seventy-one thousand, seven hundred seventy-two".