491029657 has 2 divisors, whose sum is σ = 491029658. Its totient is φ = 491029656.

The previous prime is 491029639. The next prime is 491029697. The reversal of 491029657 is 756920194.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366952336 + 124077321 = 19156^2 + 11139^2 .

It is a cyclic number.

It is not a de Polignac number, because 491029657 - 2⁷ = 491029529 is a prime.

It is a super-2 number, since 2×491029657² = 482220248107075298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491029697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245514828 + 245514829.

It is an arithmetic number, because the mean of its divisors is an integer number (245514829).

Almost surely, 2^491029657 is an apocalyptic number.

It is an amenable number.

491029657 is a deficient number, since it is larger than the sum of its proper divisors (1).

491029657 is an equidigital number, since it uses as much as digits as its factorization.

491029657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 491029657 is about 22159.1889968925. The cubic root of 491029657 is about 788.9253437811.

The spelling of 491029657 in words is "four hundred ninety-one million, twenty-nine thousand, six hundred fifty-seven".