491251927 has 4 divisors (see below), whose sum is σ = 491353120. Its totient is φ = 491150736.

The previous prime is 491251921. The next prime is 491251951. The reversal of 491251927 is 729152194.

It is a happy number.

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 491251927 - 2¹⁵ = 491219159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491251927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491251921) 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, 42927 + ... + 53152.

It is an arithmetic number, because the mean of its divisors is an integer number (122838280).

Almost surely, 2^491251927 is an apocalyptic number.

491251927 is a deficient number, since it is larger than the sum of its proper divisors (101193).

491251927 is an equidigital number, since it uses as much as digits as its factorization.

491251927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101192.

The product of its digits is 45360, while the sum is 40.

The square root of 491251927 is about 22164.2037303396. The cubic root of 491251927 is about 789.0443644156.

The spelling of 491251927 in words is "four hundred ninety-one million, two hundred fifty-one thousand, nine hundred twenty-seven".