231011440 has 40 divisors (see below), whose sum is σ = 585931248. Its totient is φ = 84003840.

The previous prime is 231011423. The next prime is 231011441. The reversal of 231011440 is 44110132.

231011440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231011441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130377 + ... + 132136.

Almost surely, 2^231011440 is an apocalyptic number.

231011440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231011440 is an abundant number, since it is smaller than the sum of its proper divisors (354919808).

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

231011440 is a wasteful number, since it uses less digits than its factorization.

231011440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262537 (or 262531 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 231011440 is about 15199.0604972807. The cubic root of 231011440 is about 613.5893727262.

Adding to 231011440 its reverse (44110132), we get a palindrome (275121572).

The spelling of 231011440 in words is "two hundred thirty-one million, eleven thousand, four hundred forty".