491510033671 has 2 divisors, whose sum is σ = 491510033672. Its totient is φ = 491510033670.

The previous prime is 491510033633. The next prime is 491510033681. The reversal of 491510033671 is 176330015194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491510033671 - 2⁹ = 491510033159 is a prime.

It is a super-2 number, since 2×491510033671² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491510033681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245755016835 + 245755016836.

It is an arithmetic number, because the mean of its divisors is an integer number (245755016836).

Almost surely, 2^491510033671 is an apocalyptic number.

491510033671 is a deficient number, since it is larger than the sum of its proper divisors (1).

491510033671 is an equidigital number, since it uses as much as digits as its factorization.

491510033671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The spelling of 491510033671 in words is "four hundred ninety-one billion, five hundred ten million, thirty-three thousand, six hundred seventy-one".