131533879861 has 2 divisors, whose sum is σ = 131533879862. Its totient is φ = 131533879860.

The previous prime is 131533879823. The next prime is 131533879891. The reversal of 131533879861 is 168978335131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115791158961 + 15742720900 = 340281^2 + 125470^2 .

It is a cyclic number.

It is not a de Polignac number, because 131533879861 - 2⁹ = 131533879349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131533879891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65766939930 + 65766939931.

It is an arithmetic number, because the mean of its divisors is an integer number (65766939931).

Almost surely, 2^131533879861 is an apocalyptic number.

It is an amenable number.

131533879861 is a deficient number, since it is larger than the sum of its proper divisors (1).

131533879861 is an equidigital number, since it uses as much as digits as its factorization.

131533879861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The spelling of 131533879861 in words is "one hundred thirty-one billion, five hundred thirty-three million, eight hundred seventy-nine thousand, eight hundred sixty-one".