231901428 has 48 divisors (see below), whose sum is σ = 592026624. Its totient is φ = 70067040.

The previous prime is 231901391. The next prime is 231901457. The reversal of 231901428 is 824109132.

231901428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 231901395 and 231901404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46051 + ... + 50837.

It is an arithmetic number, because the mean of its divisors is an integer number (12333888).

Almost surely, 2^231901428 is an apocalyptic number.

It is an amenable number.

231901428 is an abundant number, since it is smaller than the sum of its proper divisors (360125196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231901428 is a wasteful number, since it uses less digits than its factorization.

231901428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172 (or 5170 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 231901428 is about 15228.3100835254. The cubic root of 231901428 is about 614.3763285524.

The spelling of 231901428 in words is "two hundred thirty-one million, nine hundred one thousand, four hundred twenty-eight".