90928931 has 2 divisors, whose sum is σ = 90928932. Its totient is φ = 90928930.

The previous prime is 90928909. The next prime is 90928951. The reversal of 90928931 is 13982909.

It is a strong prime.

It is an emirp because it is prime and its reverse (13982909) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90928931 is a prime.

It is a super-2 number, since 2×90928931² = 16536140985605522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90928951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45464465 + 45464466.

It is an arithmetic number, because the mean of its divisors is an integer number (45464466).

Almost surely, 2^90928931 is an apocalyptic number.

90928931 is a deficient number, since it is larger than the sum of its proper divisors (1).

90928931 is an equidigital number, since it uses as much as digits as its factorization.

90928931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 90928931 is about 9535.6662588411. Note that the first 3 decimals coincide. The cubic root of 90928931 is about 449.6770209182.

The spelling of 90928931 in words is "ninety million, nine hundred twenty-eight thousand, nine hundred thirty-one".