491406515 has 4 divisors (see below), whose sum is σ = 589687824. Its totient is φ = 393125208.

The previous prime is 491406497. The next prime is 491406521. The reversal of 491406515 is 515604194.

491406515 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 491406515 - 2¹⁴ = 491390131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49140647 + ... + 49140656.

It is an arithmetic number, because the mean of its divisors is an integer number (147421956).

Almost surely, 2^491406515 is an apocalyptic number.

491406515 is a deficient number, since it is larger than the sum of its proper divisors (98281309).

491406515 is an equidigital number, since it uses as much as digits as its factorization.

491406515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98281308.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 491406515 is about 22167.6907908785. The cubic root of 491406515 is about 789.1271216807.

It can be divided in two parts, 49140 and 6515, that added together give a palindrome (55655).

The spelling of 491406515 in words is "four hundred ninety-one million, four hundred six thousand, five hundred fifteen".