499980391 has 2 divisors, whose sum is σ = 499980392. Its totient is φ = 499980390.

The previous prime is 499980379. The next prime is 499980413. The reversal of 499980391 is 193089994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 499980391 - 2⁷ = 499980263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499980301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249990195 + 249990196.

It is an arithmetic number, because the mean of its divisors is an integer number (249990196).

Almost surely, 2^499980391 is an apocalyptic number.

499980391 is a deficient number, since it is larger than the sum of its proper divisors (1).

499980391 is an equidigital number, since it uses as much as digits as its factorization.

499980391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 499980391 is about 22360.2413001291. The cubic root of 499980391 is about 793.6901500660.

The spelling of 499980391 in words is "four hundred ninety-nine million, nine hundred eighty thousand, three hundred ninety-one".