131231851 has 2 divisors, whose sum is σ = 131231852. Its totient is φ = 131231850.

The previous prime is 131231843. The next prime is 131231909. The reversal of 131231851 is 158132131.

It is a weak prime.

It is an emirp because it is prime and its reverse (158132131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131231851 - 2³ = 131231843 is a prime.

It is not a weakly prime, because it can be changed into another prime (131231831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65615925 + 65615926.

It is an arithmetic number, because the mean of its divisors is an integer number (65615926).

Almost surely, 2^131231851 is an apocalyptic number.

131231851 is a deficient number, since it is larger than the sum of its proper divisors (1).

131231851 is an equidigital number, since it uses as much as digits as its factorization.

131231851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 25.

The square root of 131231851 is about 11455.6471227076. The cubic root of 131231851 is about 508.1747531023.

Adding to 131231851 its reverse (158132131), we get a palindrome (289363982).

The spelling of 131231851 in words is "one hundred thirty-one million, two hundred thirty-one thousand, eight hundred fifty-one".