491215099 has 4 divisors (see below), whose sum is σ = 492334480. Its totient is φ = 490095720.

The previous prime is 491215097. The next prime is 491215129. The reversal of 491215099 is 990512194.

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 491215099 - 2¹ = 491215097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491215091) 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, 559032 + ... + 559909.

It is an arithmetic number, because the mean of its divisors is an integer number (123083620).

Almost surely, 2^491215099 is an apocalyptic number.

491215099 is a deficient number, since it is larger than the sum of its proper divisors (1119381).

491215099 is a wasteful number, since it uses less digits than its factorization.

491215099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119380.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 491215099 is about 22163.3729156913. The cubic root of 491215099 is about 789.0246463237.

The spelling of 491215099 in words is "four hundred ninety-one million, two hundred fifteen thousand, ninety-nine".