16909979 has 2 divisors, whose sum is σ = 16909980. Its totient is φ = 16909978.

The previous prime is 16909969. The next prime is 16910011. The reversal of 16909979 is 97990961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16909979 - 2¹² = 16905883 is a prime.

It is not a weakly prime, because it can be changed into another prime (16909969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8454989 + 8454990.

It is an arithmetic number, because the mean of its divisors is an integer number (8454990).

Almost surely, 2^16909979 is an apocalyptic number.

16909979 is a deficient number, since it is larger than the sum of its proper divisors (1).

16909979 is an equidigital number, since it uses as much as digits as its factorization.

16909979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 275562, while the sum is 50.

The square root of 16909979 is about 4112.1744855976. The cubic root of 16909979 is about 256.6734941307.

The spelling of 16909979 in words is "sixteen million, nine hundred nine thousand, nine hundred seventy-nine".