2131377645791 has 2 divisors, whose sum is σ = 2131377645792. Its totient is φ = 2131377645790.

The previous prime is 2131377645703. The next prime is 2131377645841. The reversal of 2131377645791 is 1975467731312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131377645791 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131377645391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065688822895 + 1065688822896.

It is an arithmetic number, because the mean of its divisors is an integer number (1065688822896).

Almost surely, 2^{2131377645791} is an apocalyptic number.

2131377645791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131377645791 is an equidigital number, since it uses as much as digits as its factorization.

2131377645791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6667920, while the sum is 56.

The spelling of 2131377645791 in words is "two trillion, one hundred thirty-one billion, three hundred seventy-seven million, six hundred forty-five thousand, seven hundred ninety-one".