90249331 has 2 divisors, whose sum is σ = 90249332. Its totient is φ = 90249330.

The previous prime is 90249329. The next prime is 90249359. The reversal of 90249331 is 13394209.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90249331 - 2¹ = 90249329 is a prime.

It is a super-2 number, since 2×90249331² = 16289883491895122, which contains 22 as substring.

Together with 90249329, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90249293 and 90249302.

It is not a weakly prime, because it can be changed into another prime (90249361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45124665 + 45124666.

It is an arithmetic number, because the mean of its divisors is an integer number (45124666).

Almost surely, 2^90249331 is an apocalyptic number.

90249331 is a deficient number, since it is larger than the sum of its proper divisors (1).

90249331 is an equidigital number, since it uses as much as digits as its factorization.

90249331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 90249331 is about 9499.9647894084. The cubic root of 90249331 is about 448.5539275795.

The spelling of 90249331 in words is "ninety million, two hundred forty-nine thousand, three hundred thirty-one".