1231375245 has 32 divisors (see below), whose sum is σ = 2004879360. Its totient is φ = 645226560.

The previous prime is 1231375213. The next prime is 1231375247. The reversal of 1231375245 is 5425731321.

It is not a de Polignac number, because 1231375245 - 2⁵ = 1231375213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231375247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 439800 + ... + 442590.

It is an arithmetic number, because the mean of its divisors is an integer number (62652480).

Almost surely, 2^1231375245 is an apocalyptic number.

1231375245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231375245 is a deficient number, since it is larger than the sum of its proper divisors (773504115).

1231375245 is a wasteful number, since it uses less digits than its factorization.

1231375245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305.

The product of its digits is 25200, while the sum is 33.

The square root of 1231375245 is about 35090.9567410180. The cubic root of 1231375245 is about 1071.8404418929.

The spelling of 1231375245 in words is "one billion, two hundred thirty-one million, three hundred seventy-five thousand, two hundred forty-five".