90740231 has 2 divisors, whose sum is σ = 90740232. Its totient is φ = 90740230.

The previous prime is 90740213. The next prime is 90740233. The reversal of 90740231 is 13204709.

Together with previous prime (90740213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90740231 is a prime.

It is a super-2 number, since 2×90740231² = 16467579043866722, which contains 22 as substring.

Together with 90740233, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90740231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90740233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45370115 + 45370116.

It is an arithmetic number, because the mean of its divisors is an integer number (45370116).

Almost surely, 2^90740231 is an apocalyptic number.

90740231 is a deficient number, since it is larger than the sum of its proper divisors (1).

90740231 is an equidigital number, since it uses as much as digits as its factorization.

90740231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 90740231 is about 9525.7666883039. The cubic root of 90740231 is about 449.3657418478.

The spelling of 90740231 in words is "ninety million, seven hundred forty thousand, two hundred thirty-one".