2131023111947 has 2 divisors, whose sum is σ = 2131023111948. Its totient is φ = 2131023111946.

The previous prime is 2131023111911. The next prime is 2131023112003. The reversal of 2131023111947 is 7491113201312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131023111947 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131023111047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065511555973 + 1065511555974.

It is an arithmetic number, because the mean of its divisors is an integer number (1065511555974).

Almost surely, 2^{2131023111947} is an apocalyptic number.

2131023111947 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131023111947 is an equidigital number, since it uses as much as digits as its factorization.

2131023111947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 2131023111947 in words is "two trillion, one hundred thirty-one billion, twenty-three million, one hundred eleven thousand, nine hundred forty-seven".