252664987 has 2 divisors, whose sum is σ = 252664988. Its totient is φ = 252664986.

The previous prime is 252664969. The next prime is 252665003. The reversal of 252664987 is 789466252.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252664987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 252664987.

It is not a weakly prime, because it can be changed into another prime (252664957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126332493 + 126332494.

It is an arithmetic number, because the mean of its divisors is an integer number (126332494).

Almost surely, 2^252664987 is an apocalyptic number.

252664987 is a deficient number, since it is larger than the sum of its proper divisors (1).

252664987 is an equidigital number, since it uses as much as digits as its factorization.

252664987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 49.

The square root of 252664987 is about 15895.4391886478. The cubic root of 252664987 is about 632.1910666166.

The spelling of 252664987 in words is "two hundred fifty-two million, six hundred sixty-four thousand, nine hundred eighty-seven".