87315979 has 2 divisors, whose sum is σ = 87315980. Its totient is φ = 87315978.

The previous prime is 87315947. The next prime is 87315997. The reversal of 87315979 is 97951378.

Together with next prime (87315997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87315979 - 2⁵ = 87315947 is a prime.

It is not a weakly prime, because it can be changed into another prime (87315919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43657989 + 43657990.

It is an arithmetic number, because the mean of its divisors is an integer number (43657990).

Almost surely, 2^87315979 is an apocalyptic number.

87315979 is a deficient number, since it is larger than the sum of its proper divisors (1).

87315979 is an equidigital number, since it uses as much as digits as its factorization.

87315979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 49.

The square root of 87315979 is about 9344.3019535972. The cubic root of 87315979 is about 443.6405577092.

The spelling of 87315979 in words is "eighty-seven million, three hundred fifteen thousand, nine hundred seventy-nine".