491626908601 has 2 divisors, whose sum is σ = 491626908602. Its totient is φ = 491626908600.

The previous prime is 491626908587. The next prime is 491626908613. The reversal of 491626908601 is 106809626194.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 345015264400 + 146611644201 = 587380^2 + 382899^2 .

It is a cyclic number.

It is not a de Polignac number, because 491626908601 - 2⁷ = 491626908473 is a prime.

It is not a weakly prime, because it can be changed into another prime (491626108601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245813454300 + 245813454301.

It is an arithmetic number, because the mean of its divisors is an integer number (245813454301).

Almost surely, 2^491626908601 is an apocalyptic number.

It is an amenable number.

491626908601 is a deficient number, since it is larger than the sum of its proper divisors (1).

491626908601 is an equidigital number, since it uses as much as digits as its factorization.

491626908601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 491626908601 in words is "four hundred ninety-one billion, six hundred twenty-six million, nine hundred eight thousand, six hundred one".