90392749 has 2 divisors, whose sum is σ = 90392750. Its totient is φ = 90392748.

The previous prime is 90392707. The next prime is 90392759. The reversal of 90392749 is 94729309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75377124 + 15015625 = 8682^2 + 3875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90392749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90392759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45196374 + 45196375.

It is an arithmetic number, because the mean of its divisors is an integer number (45196375).

Almost surely, 2^90392749 is an apocalyptic number.

It is an amenable number.

90392749 is a deficient number, since it is larger than the sum of its proper divisors (1).

90392749 is an equidigital number, since it uses as much as digits as its factorization.

90392749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 90392749 is about 9507.5101367288. The cubic root of 90392749 is about 448.7914054640.

The spelling of 90392749 in words is "ninety million, three hundred ninety-two thousand, seven hundred forty-nine".