499991951 has 2 divisors, whose sum is σ = 499991952. Its totient is φ = 499991950.

The previous prime is 499991941. The next prime is 499991977. The reversal of 499991951 is 159199994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 499991951 - 2⁶ = 499991887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499991911) 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 as a sum of consecutive naturals, namely, 249995975 + 249995976.

It is an arithmetic number, because the mean of its divisors is an integer number (249995976).

Almost surely, 2^499991951 is an apocalyptic number.

499991951 is a deficient number, since it is larger than the sum of its proper divisors (1).

499991951 is an equidigital number, since it uses as much as digits as its factorization.

499991951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1180980, while the sum is 56.

The square root of 499991951 is about 22360.4997931620. The cubic root of 499991951 is about 793.6962669642.

The spelling of 499991951 in words is "four hundred ninety-nine million, nine hundred ninety-one thousand, nine hundred fifty-one".