491764927 has 4 divisors (see below), whose sum is σ = 491903560. Its totient is φ = 491626296.

The previous prime is 491764913. The next prime is 491764937. The reversal of 491764927 is 729467194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491764927 - 2¹¹ = 491762879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491764937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63852 + ... + 71137.

It is an arithmetic number, because the mean of its divisors is an integer number (122975890).

Almost surely, 2^491764927 is an apocalyptic number.

491764927 is a deficient number, since it is larger than the sum of its proper divisors (138633).

491764927 is a wasteful number, since it uses less digits than its factorization.

491764927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138632.

The product of its digits is 762048, while the sum is 49.

The square root of 491764927 is about 22175.7734250691. The cubic root of 491764927 is about 789.3189275054.

The spelling of 491764927 in words is "four hundred ninety-one million, seven hundred sixty-four thousand, nine hundred twenty-seven".