2631715987 has 2 divisors, whose sum is σ = 2631715988. Its totient is φ = 2631715986.

The previous prime is 2631715969. The next prime is 2631715993. The reversal of 2631715987 is 7895171362.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2631715987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2631715987.

It is not a weakly prime, because it can be changed into another prime (2631715967) 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, 1315857993 + 1315857994.

It is an arithmetic number, because the mean of its divisors is an integer number (1315857994).

Almost surely, 2^2631715987 is an apocalyptic number.

2631715987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2631715987 is an equidigital number, since it uses as much as digits as its factorization.

2631715987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 49.

The square root of 2631715987 is about 51300.2532839751. The cubic root of 2631715987 is about 1380.6375243455.

The spelling of 2631715987 in words is "two billion, six hundred thirty-one million, seven hundred fifteen thousand, nine hundred eighty-seven".