87171157 has 2 divisors, whose sum is σ = 87171158. Its totient is φ = 87171156.

The previous prime is 87171131. The next prime is 87171179. The reversal of 87171157 is 75117178.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59197636 + 27973521 = 7694^2 + 5289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87171157 is a prime.

It is a super-2 number, since 2×87171157² = 15197621225437298, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87171857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43585578 + 43585579.

It is an arithmetic number, because the mean of its divisors is an integer number (43585579).

Almost surely, 2^87171157 is an apocalyptic number.

It is an amenable number.

87171157 is a deficient number, since it is larger than the sum of its proper divisors (1).

87171157 is an equidigital number, since it uses as much as digits as its factorization.

87171157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13720, while the sum is 37.

The square root of 87171157 is about 9336.5495232447. The cubic root of 87171157 is about 443.3951483834.

The spelling of 87171157 in words is "eighty-seven million, one hundred seventy-one thousand, one hundred fifty-seven".