86648557 has 2 divisors, whose sum is σ = 86648558. Its totient is φ = 86648556.

The previous prime is 86648533. The next prime is 86648563. The reversal of 86648557 is 75584668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76370121 + 10278436 = 8739^2 + 3206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86648557 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86648557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86648357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43324278 + 43324279.

It is an arithmetic number, because the mean of its divisors is an integer number (43324279).

Almost surely, 2^86648557 is an apocalyptic number.

It is an amenable number.

86648557 is a deficient number, since it is larger than the sum of its proper divisors (1).

86648557 is an equidigital number, since it uses as much as digits as its factorization.

86648557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1612800, while the sum is 49.

The square root of 86648557 is about 9308.5206665721. The cubic root of 86648557 is about 442.5073053578.

The spelling of 86648557 in words is "eighty-six million, six hundred forty-eight thousand, five hundred fifty-seven".