90313999987 has 2 divisors, whose sum is σ = 90313999988. Its totient is φ = 90313999986.

The previous prime is 90313999907. The next prime is 90313999991. The reversal of 90313999987 is 78999931309.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90313999987 is a prime.

It is not a weakly prime, because it can be changed into another prime (90313999907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45156999993 + 45156999994.

It is an arithmetic number, because the mean of its divisors is an integer number (45156999994).

Almost surely, 2^90313999987 is an apocalyptic number.

90313999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

90313999987 is an equidigital number, since it uses as much as digits as its factorization.

90313999987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29760696, while the sum is 67.

The spelling of 90313999987 in words is "ninety billion, three hundred thirteen million, nine hundred ninety-nine thousand, nine hundred eighty-seven".