16641979 has 2 divisors, whose sum is σ = 16641980. Its totient is φ = 16641978.

The previous prime is 16641973. The next prime is 16641983. The reversal of 16641979 is 97914661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16641979 - 2¹³ = 16633787 is a prime.

It is not a weakly prime, because it can be changed into another prime (16641973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8320989 + 8320990.

It is an arithmetic number, because the mean of its divisors is an integer number (8320990).

Almost surely, 2^16641979 is an apocalyptic number.

16641979 is a deficient number, since it is larger than the sum of its proper divisors (1).

16641979 is an equidigital number, since it uses as much as digits as its factorization.

16641979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 16641979 is about 4079.4581748070. The cubic root of 16641979 is about 255.3102925276.

The spelling of 16641979 in words is "sixteen million, six hundred forty-one thousand, nine hundred seventy-nine".