90249431 has 2 divisors, whose sum is σ = 90249432. Its totient is φ = 90249430.

The previous prime is 90249377. The next prime is 90249451. The reversal of 90249431 is 13494209.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90249431 - 2¹⁰ = 90248407 is a prime.

It is a super-2 number, since 2×90249431² = 16289919591647522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90249451) 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, 45124715 + 45124716.

It is an arithmetic number, because the mean of its divisors is an integer number (45124716).

Almost surely, 2^90249431 is an apocalyptic number.

90249431 is a deficient number, since it is larger than the sum of its proper divisors (1).

90249431 is an equidigital number, since it uses as much as digits as its factorization.

90249431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 90249431 is about 9499.9700525844. The cubic root of 90249431 is about 448.5540932516.

The spelling of 90249431 in words is "ninety million, two hundred forty-nine thousand, four hundred thirty-one".