90742831 has 2 divisors, whose sum is σ = 90742832. Its totient is φ = 90742830.

The previous prime is 90742829. The next prime is 90742867. The reversal of 90742831 is 13824709.

It is a weak prime.

It is an emirp because it is prime and its reverse (13824709) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90742831 - 2¹ = 90742829 is a prime.

It is a super-2 number, since 2×90742831² = 16468522755789122, which contains 22 as substring.

Together with 90742829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90742801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45371415 + 45371416.

It is an arithmetic number, because the mean of its divisors is an integer number (45371416).

Almost surely, 2^90742831 is an apocalyptic number.

90742831 is a deficient number, since it is larger than the sum of its proper divisors (1).

90742831 is an equidigital number, since it uses as much as digits as its factorization.

90742831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 90742831 is about 9525.9031592810. The cubic root of 90742831 is about 449.3700337323.

The spelling of 90742831 in words is "ninety million, seven hundred forty-two thousand, eight hundred thirty-one".