90437431 has 16 divisors (see below), whose sum is σ = 106686720. Its totient is φ = 75049920.

The previous prime is 90437411. The next prime is 90437483. The reversal of 90437431 is 13473409.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90437431 is a prime.

It is a super-2 number, since 2×90437431² = 16357857851759522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90437393 and 90437402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90437401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38760 + ... + 41026.

It is an arithmetic number, because the mean of its divisors is an integer number (6667920).

Almost surely, 2^90437431 is an apocalyptic number.

90437431 is a deficient number, since it is larger than the sum of its proper divisors (16249289).

90437431 is a wasteful number, since it uses less digits than its factorization.

90437431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 90437431 is about 9509.8596729920. The cubic root of 90437431 is about 448.8653405771.

The spelling of 90437431 in words is "ninety million, four hundred thirty-seven thousand, four hundred thirty-one".