16779913 has 2 divisors, whose sum is σ = 16779914. Its totient is φ = 16779912.

The previous prime is 16779911. The next prime is 16779929. The reversal of 16779913 is 31997761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14047504 + 2732409 = 3748^2 + 1653^2 .

It is a cyclic number.

It is not a de Polignac number, because 16779913 - 2¹ = 16779911 is a prime.

Together with 16779911, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16779913.

It is not a weakly prime, because it can be changed into another prime (16779911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8389956 + 8389957.

It is an arithmetic number, because the mean of its divisors is an integer number (8389957).

Almost surely, 2^16779913 is an apocalyptic number.

It is an amenable number.

16779913 is a deficient number, since it is larger than the sum of its proper divisors (1).

16779913 is an equidigital number, since it uses as much as digits as its factorization.

16779913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 43.

The square root of 16779913 is about 4096.3292104029. The cubic root of 16779913 is about 256.0137169164.

The spelling of 16779913 in words is "sixteen million, seven hundred seventy-nine thousand, nine hundred thirteen".