90230731 has 2 divisors, whose sum is σ = 90230732. Its totient is φ = 90230730.

The previous prime is 90230671. The next prime is 90230737. The reversal of 90230731 is 13703209.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90230731 - 2¹¹ = 90228683 is a prime.

It is a super-2 number, since 2×90230731² = 16283169633588722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90230696 and 90230705.

It is not a weakly prime, because it can be changed into another prime (90230737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45115365 + 45115366.

It is an arithmetic number, because the mean of its divisors is an integer number (45115366).

Almost surely, 2^90230731 is an apocalyptic number.

90230731 is a deficient number, since it is larger than the sum of its proper divisors (1).

90230731 is an equidigital number, since it uses as much as digits as its factorization.

90230731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 90230731 is about 9498.9857879671. The cubic root of 90230731 is about 448.5231104489.

It can be divided in two parts, 90 and 230731, that multiplied together give a triangular number (20765790 = T₆₄₄₄).

The spelling of 90230731 in words is "ninety million, two hundred thirty thousand, seven hundred thirty-one".