90570731 has 2 divisors, whose sum is σ = 90570732. Its totient is φ = 90570730.

The previous prime is 90570721. The next prime is 90570751. The reversal of 90570731 is 13707509.

It is a weak prime.

It is an emirp because it is prime and its reverse (13707509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90570731 - 2¹⁰ = 90569707 is a prime.

It is a super-2 number, since 2×90570731² = 16406114627748722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90570721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45285365 + 45285366.

It is an arithmetic number, because the mean of its divisors is an integer number (45285366).

Almost surely, 2^90570731 is an apocalyptic number.

90570731 is a deficient number, since it is larger than the sum of its proper divisors (1).

90570731 is an equidigital number, since it uses as much as digits as its factorization.

90570731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6615, while the sum is 32.

The square root of 90570731 is about 9516.8656079615. The cubic root of 90570731 is about 449.0857669206.

The spelling of 90570731 in words is "ninety million, five hundred seventy thousand, seven hundred thirty-one".