90233431 has 4 divisors (see below), whose sum is σ = 90330264. Its totient is φ = 90136600.

The previous prime is 90233383. The next prime is 90233447. The reversal of 90233431 is 13433209.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13433209 = 19 ⋅707011.

It is a cyclic number.

It is not a de Polignac number, because 90233431 - 2¹⁹ = 89709143 is a prime.

It is a super-2 number, since 2×90233431² = 16284144140063522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90233396 and 90233405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90233461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47005 + ... + 48886.

It is an arithmetic number, because the mean of its divisors is an integer number (22582566).

Almost surely, 2^90233431 is an apocalyptic number.

90233431 is a deficient number, since it is larger than the sum of its proper divisors (96833).

90233431 is an equidigital number, since it uses as much as digits as its factorization.

90233431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96832.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 90233431 is about 9499.1279073397. The cubic root of 90233431 is about 448.5275841661.

The spelling of 90233431 in words is "ninety million, two hundred thirty-three thousand, four hundred thirty-one".