87331117 has 2 divisors, whose sum is σ = 87331118. Its totient is φ = 87331116.

The previous prime is 87331081. The next prime is 87331129. The reversal of 87331117 is 71113378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70241161 + 17089956 = 8381^2 + 4134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87331117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87331157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43665558 + 43665559.

It is an arithmetic number, because the mean of its divisors is an integer number (43665559).

Almost surely, 2^87331117 is an apocalyptic number.

It is an amenable number.

87331117 is a deficient number, since it is larger than the sum of its proper divisors (1).

87331117 is an equidigital number, since it uses as much as digits as its factorization.

87331117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 31.

The square root of 87331117 is about 9345.1119308438. Note that the first 3 decimals coincide. The cubic root of 87331117 is about 443.6661942642. Note that the first 3 decimals are identical.

The spelling of 87331117 in words is "eighty-seven million, three hundred thirty-one thousand, one hundred seventeen".