83161557 has 6 divisors (see below), whose sum is σ = 120122262. Its totient is φ = 55441032.

The previous prime is 83161549. The next prime is 83161567. The reversal of 83161557 is 75516138.

83161557 is a `hidden beast` number, since 8 + 31 + 615 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55219761 + 27941796 = 7431^2 + 5286^2 .

It is not a de Polignac number, because 83161557 - 2³ = 83161549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83161517) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4620078 + ... + 4620095.

It is an arithmetic number, because the mean of its divisors is an integer number (20020377).

Almost surely, 2^83161557 is an apocalyptic number.

It is an amenable number.

83161557 is a deficient number, since it is larger than the sum of its proper divisors (36960705).

83161557 is a wasteful number, since it uses less digits than its factorization.

83161557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9240179 (or 9240176 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 83161557 is about 9119.2958609752. The cubic root of 83161557 is about 436.4899050188.

The spelling of 83161557 in words is "eighty-three million, one hundred sixty-one thousand, five hundred fifty-seven".