231133040 has 20 divisors (see below), whose sum is σ = 537384504. Its totient is φ = 92453184.

The previous prime is 231133039. The next prime is 231133093. The reversal of 231133040 is 40331132.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1444502 + ... + 1444661.

Almost surely, 2^231133040 is an apocalyptic number.

231133040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231133040 is an abundant number, since it is smaller than the sum of its proper divisors (306251464).

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

231133040 is a wasteful number, since it uses less digits than its factorization.

231133040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889176 (or 2889170 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231133040 is about 15203.0602182587. The cubic root of 231133040 is about 613.6970144084.

Adding to 231133040 its reverse (40331132), we get a palindrome (271464172).

The spelling of 231133040 in words is "two hundred thirty-one million, one hundred thirty-three thousand, forty".