131251643 has 2 divisors, whose sum is σ = 131251644. Its totient is φ = 131251642.

The previous prime is 131251633. The next prime is 131251649. The reversal of 131251643 is 346152131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131251643 - 2¹⁰ = 131250619 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (131251649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65625821 + 65625822.

It is an arithmetic number, because the mean of its divisors is an integer number (65625822).

Almost surely, 2^131251643 is an apocalyptic number.

131251643 is a deficient number, since it is larger than the sum of its proper divisors (1).

131251643 is an equidigital number, since it uses as much as digits as its factorization.

131251643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 131251643 is about 11456.5109435639. The cubic root of 131251643 is about 508.2002989563.

The spelling of 131251643 in words is "one hundred thirty-one million, two hundred fifty-one thousand, six hundred forty-three".