1231289472 has 64 divisors (see below), whose sum is σ = 3737851200. Its totient is φ = 351796224.

The previous prime is 1231289461. The next prime is 1231289483. The reversal of 1231289472 is 2749821321.

It is an interprime number because it is at equal distance from previous prime (1231289461) and next prime (1231289483).

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 1231289472.

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, 226347 + ... + 231722.

It is an arithmetic number, because the mean of its divisors is an integer number (58403925).

Almost surely, 2^1231289472 is an apocalyptic number.

1231289472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231289472 is an abundant number, since it is smaller than the sum of its proper divisors (2506561728).

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

1231289472 is an equidigital number, since it uses as much as digits as its factorization.

1231289472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458093 (or 458081 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 1231289472 is about 35089.7345672492. The cubic root of 1231289472 is about 1071.8155545145.

It can be divided in two parts, 1231 and 289472, that added together give a triangular number (290703 = T₇₆₂).

The spelling of 1231289472 in words is "one billion, two hundred thirty-one million, two hundred eighty-nine thousand, four hundred seventy-two".