90423431 has 4 divisors (see below), whose sum is σ = 103341072. Its totient is φ = 77505792.

The previous prime is 90423427. The next prime is 90423433. The reversal of 90423431 is 13432409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13432409 = 127 ⋅105767.

It is not a de Polignac number, because 90423431 - 2² = 90423427 is a prime.

It is a super-3 number, since 3×90423431³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 90423431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90423433) 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, 6458810 + ... + 6458823.

It is an arithmetic number, because the mean of its divisors is an integer number (25835268).

Almost surely, 2^90423431 is an apocalyptic number.

90423431 is a deficient number, since it is larger than the sum of its proper divisors (12917641).

90423431 is a wasteful number, since it uses less digits than its factorization.

90423431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12917640.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 90423431 is about 9509.1235663441. The cubic root of 90423431 is about 448.8421774576.

The spelling of 90423431 in words is "ninety million, four hundred twenty-three thousand, four hundred thirty-one".