90231001 has 27 divisors (see below), whose sum is σ = 111615861. Its totient is φ = 72724344.

The previous prime is 90230999. The next prime is 90231013. The reversal of 90231001 is 10013209.

The square root of 90231001 is 9499.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 90231001 - 2¹ = 90230999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90231061) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1529310 + ... + 1529368.

Almost surely, 2^90231001 is an apocalyptic number.

90231001 is the 9499-th square number.

90231001 is the 4750-th centered octagonal number.

It is an amenable number.

90231001 is a deficient number, since it is larger than the sum of its proper divisors (21384860).

90231001 is an equidigital number, since it uses as much as digits as its factorization.

90231001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 16.

The cubic root of 90231001 is about 448.5235578246.

Multiplying 90231001 by its sum of digits (16), we get a square (1443696016 = 37996²).

The spelling of 90231001 in words is "ninety million, two hundred thirty-one thousand, one".