131178342391 has 2 divisors, whose sum is σ = 131178342392. Its totient is φ = 131178342390.

The previous prime is 131178342353. The next prime is 131178342437. The reversal of 131178342391 is 193243871131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131178342391 - 2¹¹ = 131178340343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131178342331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65589171195 + 65589171196.

It is an arithmetic number, because the mean of its divisors is an integer number (65589171196).

Almost surely, 2^131178342391 is an apocalyptic number.

131178342391 is a deficient number, since it is larger than the sum of its proper divisors (1).

131178342391 is an equidigital number, since it uses as much as digits as its factorization.

131178342391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The spelling of 131178342391 in words is "one hundred thirty-one billion, one hundred seventy-eight million, three hundred forty-two thousand, three hundred ninety-one".