1231658857 has 16 divisors (see below), whose sum is σ = 1532103552. Its totient is φ = 972760320.

The previous prime is 1231658851. The next prime is 1231658873. The reversal of 1231658857 is 7588561321.

It is a cyclic number.

It is not a de Polignac number, because 1231658857 - 2¹⁵ = 1231626089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231658851) 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 15 ways as a sum of consecutive naturals, for example, 250893 + ... + 255754.

It is an arithmetic number, because the mean of its divisors is an integer number (95756472).

Almost surely, 2^1231658857 is an apocalyptic number.

1231658857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1231658857 is a deficient number, since it is larger than the sum of its proper divisors (300444695).

1231658857 is a wasteful number, since it uses less digits than its factorization.

1231658857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506688.

The product of its digits is 403200, while the sum is 46.

The square root of 1231658857 is about 35094.9976064966. The cubic root of 1231658857 is about 1071.9227248193.

The spelling of 1231658857 in words is "one billion, two hundred thirty-one million, six hundred fifty-eight thousand, eight hundred fifty-seven".