87631214639 has 2 divisors, whose sum is σ = 87631214640. Its totient is φ = 87631214638.

The previous prime is 87631214603. The next prime is 87631214677. The reversal of 87631214639 is 93641213678.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87631214639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87631211639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43815607319 + 43815607320.

It is an arithmetic number, because the mean of its divisors is an integer number (43815607320).

Almost surely, 2^87631214639 is an apocalyptic number.

87631214639 is a deficient number, since it is larger than the sum of its proper divisors (1).

87631214639 is an equidigital number, since it uses as much as digits as its factorization.

87631214639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 50.

The spelling of 87631214639 in words is "eighty-seven billion, six hundred thirty-one million, two hundred fourteen thousand, six hundred thirty-nine".