90992639 has 2 divisors, whose sum is σ = 90992640. Its totient is φ = 90992638.

The previous prime is 90992581. The next prime is 90992701. The reversal of 90992639 is 93629909.

It is a weak prime.

It is an emirp because it is prime and its reverse (93629909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90992639 - 2¹² = 90988543 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90992593 and 90992602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90992039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45496319 + 45496320.

It is an arithmetic number, because the mean of its divisors is an integer number (45496320).

Almost surely, 2^90992639 is an apocalyptic number.

90992639 is a deficient number, since it is larger than the sum of its proper divisors (1).

90992639 is an equidigital number, since it uses as much as digits as its factorization.

90992639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 47.

The square root of 90992639 is about 9539.0061851327. The cubic root of 90992639 is about 449.7820162346.

The spelling of 90992639 in words is "ninety million, nine hundred ninety-two thousand, six hundred thirty-nine".