499927991 has 2 divisors, whose sum is σ = 499927992. Its totient is φ = 499927990.

The previous prime is 499927957. The next prime is 499928003. The reversal of 499927991 is 199729994.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 499927991 - 2⁶ = 499927927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 499927991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499927921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249963995 + 249963996.

It is an arithmetic number, because the mean of its divisors is an integer number (249963996).

Almost surely, 2^499927991 is an apocalyptic number.

499927991 is a deficient number, since it is larger than the sum of its proper divisors (1).

499927991 is an equidigital number, since it uses as much as digits as its factorization.

499927991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3306744, while the sum is 59.

The square root of 499927991 is about 22359.0695468304. The cubic root of 499927991 is about 793.6624217674.

The spelling of 499927991 in words is "four hundred ninety-nine million, nine hundred twenty-seven thousand, nine hundred ninety-one".