90872731 has 2 divisors, whose sum is σ = 90872732. Its totient is φ = 90872730.

The previous prime is 90872713. The next prime is 90872741. The reversal of 90872731 is 13727809.

Together with previous prime (90872713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13727809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90872731 - 2⁷ = 90872603 is a prime.

It is a super-2 number, since 2×90872731² = 16515706478796722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90872711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45436365 + 45436366.

It is an arithmetic number, because the mean of its divisors is an integer number (45436366).

Almost surely, 2^90872731 is an apocalyptic number.

90872731 is a deficient number, since it is larger than the sum of its proper divisors (1).

90872731 is an equidigital number, since it uses as much as digits as its factorization.

90872731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 90872731 is about 9532.7189720457. The cubic root of 90872731 is about 449.5843585989.

The spelling of 90872731 in words is "ninety million, eight hundred seventy-two thousand, seven hundred thirty-one".