499991651 has 2 divisors, whose sum is σ = 499991652. Its totient is φ = 499991650.

The previous prime is 499991647. The next prime is 499991677. The reversal of 499991651 is 156199994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 499991651 - 2² = 499991647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 499991593 and 499991602.

It is not a weakly prime, because it can be changed into another prime (499991851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249995825 + 249995826.

It is an arithmetic number, because the mean of its divisors is an integer number (249995826).

Almost surely, 2^499991651 is an apocalyptic number.

499991651 is a deficient number, since it is larger than the sum of its proper divisors (1).

499991651 is an equidigital number, since it uses as much as digits as its factorization.

499991651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 787320, while the sum is 53.

The square root of 499991651 is about 22360.4930849031. The cubic root of 499991651 is about 793.6961082224.

The spelling of 499991651 in words is "four hundred ninety-nine million, nine hundred ninety-one thousand, six hundred fifty-one".