13131001020491 has 2 divisors, whose sum is σ = 13131001020492. Its totient is φ = 13131001020490.

The previous prime is 13131001020433. The next prime is 13131001020569. The reversal of 13131001020491 is 19402010013131.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13131001020491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13131001020491.

It is not a weakly prime, because it can be changed into another prime (13131001020421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6565500510245 + 6565500510246.

It is an arithmetic number, because the mean of its divisors is an integer number (6565500510246).

Almost surely, 2^{13131001020491} is an apocalyptic number.

13131001020491 is a deficient number, since it is larger than the sum of its proper divisors (1).

13131001020491 is an equidigital number, since it uses as much as digits as its factorization.

13131001020491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 13131001020491 in words is "thirteen trillion, one hundred thirty-one billion, one million, twenty thousand, four hundred ninety-one".