231143538 has 16 divisors (see below), whose sum is σ = 462455136. Its totient is φ = 77019840.

The previous prime is 231143513. The next prime is 231143581. The reversal of 231143538 is 835341132.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17445 + ... + 27687.

It is an arithmetic number, because the mean of its divisors is an integer number (28903446).

Almost surely, 2^231143538 is an apocalyptic number.

231143538 is an abundant number, since it is smaller than the sum of its proper divisors (231311598).

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

231143538 is a wasteful number, since it uses less digits than its factorization.

231143538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14009.

The product of its digits is 8640, while the sum is 30.

The square root of 231143538 is about 15203.4054737746. The cubic root of 231143538 is about 613.7063055851.

The spelling of 231143538 in words is "two hundred thirty-one million, one hundred forty-three thousand, five hundred thirty-eight".