491047913 has 16 divisors (see below), whose sum is σ = 524113920. Its totient is φ = 458752896.

The previous prime is 491047901. The next prime is 491047937. The reversal of 491047913 is 319740194.

It is a cyclic number.

It is not a de Polignac number, because 491047913 - 2⁶ = 491047849 is a prime.

It is a super-2 number, since 2×491047913² = 482256105723311138, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (491047993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 474845 + ... + 475877.

It is an arithmetic number, because the mean of its divisors is an integer number (32757120).

Almost surely, 2^491047913 is an apocalyptic number.

It is an amenable number.

491047913 is a deficient number, since it is larger than the sum of its proper divisors (33066007).

491047913 is a wasteful number, since it uses less digits than its factorization.

491047913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 491047913 is about 22159.6009214968. The cubic root of 491047913 is about 788.9351208162.

The spelling of 491047913 in words is "four hundred ninety-one million, forty-seven thousand, nine hundred thirteen".