90430987 has 2 divisors, whose sum is σ = 90430988. Its totient is φ = 90430986.

The previous prime is 90430981. The next prime is 90431017. The reversal of 90430987 is 78903409.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90430987 - 2⁷ = 90430859 is a prime.

It is not a weakly prime, because it can be changed into another prime (90430981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45215493 + 45215494.

It is an arithmetic number, because the mean of its divisors is an integer number (45215494).

Almost surely, 2^90430987 is an apocalyptic number.

90430987 is a deficient number, since it is larger than the sum of its proper divisors (1).

90430987 is an equidigital number, since it uses as much as digits as its factorization.

90430987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 90430987 is about 9509.5208606953. The cubic root of 90430987 is about 448.8546792211.

The spelling of 90430987 in words is "ninety million, four hundred thirty thousand, nine hundred eighty-seven".