90430231 has 2 divisors, whose sum is σ = 90430232. Its totient is φ = 90430230.

The previous prime is 90430229. The next prime is 90430237. The reversal of 90430231 is 13203409.

It is a weak prime.

It is an emirp because it is prime and its reverse (13203409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90430231 - 2¹ = 90430229 is a prime.

It is a super-2 number, since 2×90430231² = 16355253357426722, which contains 22 as substring.

Together with 90430229, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90430237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45215115 + 45215116.

It is an arithmetic number, because the mean of its divisors is an integer number (45215116).

Almost surely, 2^90430231 is an apocalyptic number.

90430231 is a deficient number, since it is larger than the sum of its proper divisors (1).

90430231 is an equidigital number, since it uses as much as digits as its factorization.

90430231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 90430231 is about 9509.4811109755. The cubic root of 90430231 is about 448.8534284143.

The spelling of 90430231 in words is "ninety million, four hundred thirty thousand, two hundred thirty-one".