90436712987 has 2 divisors, whose sum is σ = 90436712988. Its totient is φ = 90436712986.

The previous prime is 90436712941. The next prime is 90436713053. The reversal of 90436712987 is 78921763409.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90436712987 - 2¹² = 90436708891 is a prime.

It is not a weakly prime, because it can be changed into another prime (90436714987) 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, 45218356493 + 45218356494.

It is an arithmetic number, because the mean of its divisors is an integer number (45218356494).

Almost surely, 2^90436712987 is an apocalyptic number.

90436712987 is a deficient number, since it is larger than the sum of its proper divisors (1).

90436712987 is an equidigital number, since it uses as much as digits as its factorization.

90436712987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4572288, while the sum is 56.

The spelling of 90436712987 in words is "ninety billion, four hundred thirty-six million, seven hundred twelve thousand, nine hundred eighty-seven".