499999999979 has 2 divisors, whose sum is σ = 499999999980. Its totient is φ = 499999999978.

The previous prime is 499999999943. The next prime is 500000000023. The reversal of 499999999979 is 979999999994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 499999999979 - 2¹⁶ = 499999934443 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (499999992979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249999999989 + 249999999990.

It is an arithmetic number, because the mean of its divisors is an integer number (249999999990).

Almost surely, 2^499999999979 is an apocalyptic number.

499999999979 is a deficient number, since it is larger than the sum of its proper divisors (1).

499999999979 is an equidigital number, since it uses as much as digits as its factorization.

499999999979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97629963228, while the sum is 101.

The spelling of 499999999979 in words is "four hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-nine".