491223865 has 8 divisors (see below), whose sum is σ = 643056768. Its totient is φ = 357253680.

The previous prime is 491223847. The next prime is 491223893. The reversal of 491223865 is 568322194.

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

It is not a de Polignac number, because 491223865 - 2⁹ = 491223353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4465617 + ... + 4465726.

It is an arithmetic number, because the mean of its divisors is an integer number (80382096).

Almost surely, 2^491223865 is an apocalyptic number.

It is an amenable number.

491223865 is a deficient number, since it is larger than the sum of its proper divisors (151832903).

491223865 is a wasteful number, since it uses less digits than its factorization.

491223865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8931359.

The product of its digits is 103680, while the sum is 40.

The square root of 491223865 is about 22163.5706735174. The cubic root of 491223865 is about 789.0293398201.

The spelling of 491223865 in words is "four hundred ninety-one million, two hundred twenty-three thousand, eight hundred sixty-five".