491953507 has 2 divisors, whose sum is σ = 491953508. Its totient is φ = 491953506.

The previous prime is 491953499. The next prime is 491953519. The reversal of 491953507 is 705359194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491953507 - 2³ = 491953499 is a prime.

It is not a weakly prime, because it can be changed into another prime (491953577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245976753 + 245976754.

It is an arithmetic number, because the mean of its divisors is an integer number (245976754).

Almost surely, 2^491953507 is an apocalyptic number.

491953507 is a deficient number, since it is larger than the sum of its proper divisors (1).

491953507 is an equidigital number, since it uses as much as digits as its factorization.

491953507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 491953507 is about 22180.0249549003. The cubic root of 491953507 is about 789.4198095410.

The spelling of 491953507 in words is "four hundred ninety-one million, nine hundred fifty-three thousand, five hundred seven".