87797131 has 2 divisors, whose sum is σ = 87797132. Its totient is φ = 87797130.

The previous prime is 87797093. The next prime is 87797147. The reversal of 87797131 is 13179778.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87797131 - 2²¹ = 85699979 is a prime.

It is a super-2 number, since 2×87797131² = 15416672423662322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87797191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43898565 + 43898566.

It is an arithmetic number, because the mean of its divisors is an integer number (43898566).

Almost surely, 2^87797131 is an apocalyptic number.

87797131 is a deficient number, since it is larger than the sum of its proper divisors (1).

87797131 is an equidigital number, since it uses as much as digits as its factorization.

87797131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 43.

The square root of 87797131 is about 9370.0123265661. The cubic root of 87797131 is about 444.4539546553.

The spelling of 87797131 in words is "eighty-seven million, seven hundred ninety-seven thousand, one hundred thirty-one".