90808631 has 2 divisors, whose sum is σ = 90808632. Its totient is φ = 90808630.

The previous prime is 90808609. The next prime is 90808649. The reversal of 90808631 is 13680809.

It is a strong prime.

It is an emirp because it is prime and its reverse (13680809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90808631 - 2⁶ = 90808567 is a prime.

It is a super-2 number, since 2×90808631² = 16492414928188322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90808591 and 90808600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90808681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45404315 + 45404316.

It is an arithmetic number, because the mean of its divisors is an integer number (45404316).

Almost surely, 2^90808631 is an apocalyptic number.

90808631 is a deficient number, since it is larger than the sum of its proper divisors (1).

90808631 is an equidigital number, since it uses as much as digits as its factorization.

90808631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 90808631 is about 9529.3562741667. The cubic root of 90808631 is about 449.4786241440.

The spelling of 90808631 in words is "ninety million, eight hundred eight thousand, six hundred thirty-one".