491772565 has 8 divisors (see below), whose sum is σ = 590436000. Its totient is φ = 393212112.

The previous prime is 491772529. The next prime is 491772577. The reversal of 491772565 is 565277194.

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 491772565 - 2¹⁵ = 491739797 is a prime.

It is a congruent 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, 14815 + ... + 34684.

It is an arithmetic number, because the mean of its divisors is an integer number (73804500).

Almost surely, 2^491772565 is an apocalyptic number.

It is an amenable number.

491772565 is a deficient number, since it is larger than the sum of its proper divisors (98663435).

491772565 is a wasteful number, since it uses less digits than its factorization.

491772565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51491.

The product of its digits is 529200, while the sum is 46.

The square root of 491772565 is about 22175.9456393634. The cubic root of 491772565 is about 789.3230140017.

The spelling of 491772565 in words is "four hundred ninety-one million, seven hundred seventy-two thousand, five hundred sixty-five".