1231375864 has 64 divisors (see below), whose sum is σ = 2499235200. Its totient is φ = 566891136.

The previous prime is 1231375853. The next prime is 1231375867. The reversal of 1231375864 is 4685731321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231375867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1914727 + ... + 1915369.

It is an arithmetic number, because the mean of its divisors is an integer number (39050550).

Almost surely, 2^1231375864 is an apocalyptic number.

It is an amenable number.

1231375864 is an abundant number, since it is smaller than the sum of its proper divisors (1267859336).

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

1231375864 is a wasteful number, since it uses less digits than its factorization.

1231375864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004 (or 1000 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 1231375864 is about 35090.9655609531. The cubic root of 1231375864 is about 1071.8406214940.

The spelling of 1231375864 in words is "one billion, two hundred thirty-one million, three hundred seventy-five thousand, eight hundred sixty-four".