1231854957 has 12 divisors (see below), whose sum is σ = 1780710204. Its totient is φ = 820607040.

The previous prime is 1231854947. The next prime is 1231854961. The reversal of 1231854957 is 7594581321.

It can be written as a sum of positive squares in 2 ways, for example, as 649791081 + 582063876 = 25491^2 + 24126^2 .

It is not a de Polignac number, because 1231854957 - 2⁶ = 1231854893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231854937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39918 + ... + 63695.

It is an arithmetic number, because the mean of its divisors is an integer number (148392517).

Almost surely, 2^1231854957 is an apocalyptic number.

It is an amenable number.

1231854957 is a deficient number, since it is larger than the sum of its proper divisors (548855247).

1231854957 is a wasteful number, since it uses less digits than its factorization.

1231854957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104940 (or 104937 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 1231854957 is about 35097.7913407667. The cubic root of 1231854957 is about 1071.9796109422.

The spelling of 1231854957 in words is "one billion, two hundred thirty-one million, eight hundred fifty-four thousand, nine hundred fifty-seven".