491268915 has 16 divisors (see below), whose sum is σ = 873367200. Its totient is φ = 262010016.

The previous prime is 491268913. The next prime is 491268917. The reversal of 491268915 is 519862194.

It is an interprime number because it is at equal distance from previous prime (491268913) and next prime (491268917).

It is not a de Polignac number, because 491268915 - 2¹ = 491268913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (491268913) 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, 1819380 + ... + 1819649.

It is an arithmetic number, because the mean of its divisors is an integer number (54585450).

Almost surely, 2^491268915 is an apocalyptic number.

491268915 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

491268915 is a deficient number, since it is larger than the sum of its proper divisors (382098285).

491268915 is a wasteful number, since it uses less digits than its factorization.

491268915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3639043 (or 3639037 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 491268915 is about 22164.5869575772. The cubic root of 491268915 is about 789.0534596344.

The spelling of 491268915 in words is "four hundred ninety-one million, two hundred sixty-eight thousand, nine hundred fifteen".