90779431 has 2 divisors, whose sum is σ = 90779432. Its totient is φ = 90779430.

The previous prime is 90779417. The next prime is 90779443. The reversal of 90779431 is 13497709.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90779431 - 2⁵ = 90779399 is a prime.

It is a super-2 number, since 2×90779431² = 16481810185367522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90779461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45389715 + 45389716.

It is an arithmetic number, because the mean of its divisors is an integer number (45389716).

Almost surely, 2^90779431 is an apocalyptic number.

90779431 is a deficient number, since it is larger than the sum of its proper divisors (1).

90779431 is an equidigital number, since it uses as much as digits as its factorization.

90779431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 90779431 is about 9527.8240432955. The cubic root of 90779431 is about 449.4304415622.

The spelling of 90779431 in words is "ninety million, seven hundred seventy-nine thousand, four hundred thirty-one".