231431123440 has 80 divisors (see below), whose sum is σ = 587248413696. Its totient is φ = 84120224000.

The previous prime is 231431123431. The next prime is 231431123471. The reversal of 231431123440 is 44321134132.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 231431123399 and 231431123408.

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, 2012949 + ... + 2124811.

Almost surely, 2^231431123440 is an apocalyptic number.

231431123440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231431123440 is an abundant number, since it is smaller than the sum of its proper divisors (355817290256).

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

231431123440 is a wasteful number, since it uses less digits than its factorization.

231431123440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114238 (or 114232 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 231431123440 its reverse (44321134132), we get a palindrome (275752257572).

The spelling of 231431123440 in words is "two hundred thirty-one billion, four hundred thirty-one million, one hundred twenty-three thousand, four hundred forty".