491079487 has 4 divisors (see below), whose sum is σ = 491145400. Its totient is φ = 491013576.

The previous prime is 491079469. The next prime is 491079497. The reversal of 491079487 is 784970194.

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 491079487 - 2¹⁵ = 491046719 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 491079487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491079467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20112 + ... + 37237.

It is an arithmetic number, because the mean of its divisors is an integer number (122786350).

Almost surely, 2^491079487 is an apocalyptic number.

491079487 is a deficient number, since it is larger than the sum of its proper divisors (65913).

491079487 is an equidigital number, since it uses as much as digits as its factorization.

491079487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65912.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 491079487 is about 22160.3133326224. The cubic root of 491079487 is about 788.9520297593.

The spelling of 491079487 in words is "four hundred ninety-one million, seventy-nine thousand, four hundred eighty-seven".