161771056 has 20 divisors (see below), whose sum is σ = 315061432. Its totient is φ = 80464896.

The previous prime is 161771041. The next prime is 161771059. The reversal of 161771056 is 650177161.

It is not an unprimeable number, because it can be changed into a prime (161771059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23106 + ... + 29281.

Almost surely, 2^161771056 is an apocalyptic number.

161771056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161771056 is a deficient number, since it is larger than the sum of its proper divisors (153290376).

161771056 is a wasteful number, since it uses less digits than its factorization.

161771056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52588 (or 52582 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 161771056 is about 12718.9251118166. The cubic root of 161771056 is about 544.8792550173.

The spelling of 161771056 in words is "one hundred sixty-one million, seven hundred seventy-one thousand, fifty-six".