90188431 has 2 divisors, whose sum is σ = 90188432. Its totient is φ = 90188430.

The previous prime is 90188429. The next prime is 90188443. The reversal of 90188431 is 13488109.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90188431 - 2¹ = 90188429 is a prime.

It is a super-3 number, since 3×90188431³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 90188429, 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 (90188411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45094215 + 45094216.

It is an arithmetic number, because the mean of its divisors is an integer number (45094216).

Almost surely, 2^90188431 is an apocalyptic number.

90188431 is a deficient number, since it is larger than the sum of its proper divisors (1).

90188431 is an equidigital number, since it uses as much as digits as its factorization.

90188431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 90188431 is about 9496.7589734604. The cubic root of 90188431 is about 448.4530105583.

The spelling of 90188431 in words is "ninety million, one hundred eighty-eight thousand, four hundred thirty-one".