1231518974 has 36 divisors (see below), whose sum is σ = 2155995816. Its totient is φ = 516820416.

The previous prime is 1231518973. The next prime is 1231518997. The reversal of 1231518974 is 4798151321.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231518973) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10898342 + ... + 10898454.

Almost surely, 2^1231518974 is an apocalyptic number.

1231518974 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1231518974 is a deficient number, since it is larger than the sum of its proper divisors (924476842).

1231518974 is an frugal number, since it uses more digits than its factorization.

1231518974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 205 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The square root of 1231518974 is about 35093.0046305528. The cubic root of 1231518974 is about 1071.8821428452.

The spelling of 1231518974 in words is "one billion, two hundred thirty-one million, five hundred eighteen thousand, nine hundred seventy-four".