491457068351 has 2 divisors, whose sum is σ = 491457068352. Its totient is φ = 491457068350.

The previous prime is 491457068299. The next prime is 491457068359. The reversal of 491457068351 is 153860754194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491457068351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491457068293 and 491457068302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491457068359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245728534175 + 245728534176.

It is an arithmetic number, because the mean of its divisors is an integer number (245728534176).

Almost surely, 2^491457068351 is an apocalyptic number.

491457068351 is a deficient number, since it is larger than the sum of its proper divisors (1).

491457068351 is an equidigital number, since it uses as much as digits as its factorization.

491457068351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 491457068351 in words is "four hundred ninety-one billion, four hundred fifty-seven million, sixty-eight thousand, three hundred fifty-one".