90450431 has 8 divisors (see below), whose sum is σ = 96516720. Its totient is φ = 84514752.

The previous prime is 90450413. The next prime is 90450461. The reversal of 90450431 is 13405409.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90450431 - 2²² = 86256127 is a prime.

It is a super-2 number, since 2×90450431² = 16362560936171522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90450431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90450401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31220 + ... + 33993.

It is an arithmetic number, because the mean of its divisors is an integer number (12064590).

Almost surely, 2^90450431 is an apocalyptic number.

90450431 is a deficient number, since it is larger than the sum of its proper divisors (6066289).

90450431 is a wasteful number, since it uses less digits than its factorization.

90450431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65305.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 90450431 is about 9510.5431495788. The cubic root of 90450431 is about 448.8868470477.

The spelling of 90450431 in words is "ninety million, four hundred fifty thousand, four hundred thirty-one".