491565919 has 8 divisors (see below), whose sum is σ = 529950960. Its totient is φ = 453262656.

The previous prime is 491565881. The next prime is 491565941. The reversal of 491565919 is 919565194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491565919 - 2²¹ = 489468767 is a prime.

It is a super-2 number, since 2×491565919² = 483274105444629122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491565989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7654 + ... + 32275.

It is an arithmetic number, because the mean of its divisors is an integer number (66243870).

Almost surely, 2^491565919 is an apocalyptic number.

491565919 is a deficient number, since it is larger than the sum of its proper divisors (38385041).

491565919 is a wasteful number, since it uses less digits than its factorization.

491565919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40889.

The product of its digits is 437400, while the sum is 49.

The square root of 491565919 is about 22171.2859121883. The cubic root of 491565919 is about 789.2124389737.

The spelling of 491565919 in words is "four hundred ninety-one million, five hundred sixty-five thousand, nine hundred nineteen".