2491372775401 has 2 divisors, whose sum is σ = 2491372775402. Its totient is φ = 2491372775400.

The previous prime is 2491372775383. The next prime is 2491372775431. The reversal of 2491372775401 is 1045772731942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2316712305625 + 174660469776 = 1522075^2 + 417924^2 .

It is a cyclic number.

It is not a de Polignac number, because 2491372775401 - 2³³ = 2482782840809 is a prime.

It is not a weakly prime, because it can be changed into another prime (2491372775431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245686387700 + 1245686387701.

It is an arithmetic number, because the mean of its divisors is an integer number (1245686387701).

Almost surely, 2^{2491372775401} is an apocalyptic number.

It is an amenable number.

2491372775401 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491372775401 is an equidigital number, since it uses as much as digits as its factorization.

2491372775401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2963520, while the sum is 52.

The spelling of 2491372775401 in words is "two trillion, four hundred ninety-one billion, three hundred seventy-two million, seven hundred seventy-five thousand, four hundred one".