90043531 has 4 divisors (see below), whose sum is σ = 90648000. Its totient is φ = 89439064.

The previous prime is 90043523. The next prime is 90043537. The reversal of 90043531 is 13534009.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90043531 - 2³ = 90043523 is a prime.

It is a super-2 number, since 2×90043531² = 16215674949895922, 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 = 90043496 and 90043505.

It is not an unprimeable number, because it can be changed into a prime (90043537) 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, 302011 + ... + 302308.

It is an arithmetic number, because the mean of its divisors is an integer number (22662000).

Almost surely, 2^90043531 is an apocalyptic number.

90043531 is a deficient number, since it is larger than the sum of its proper divisors (604469).

90043531 is a wasteful number, since it uses less digits than its factorization.

90043531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604468.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 90043531 is about 9489.1269882956. The cubic root of 90043531 is about 448.2127148729.

The spelling of 90043531 in words is "ninety million, forty-three thousand, five hundred thirty-one".