13185979 has 2 divisors, whose sum is σ = 13185980. Its totient is φ = 13185978.

The previous prime is 13185971. The next prime is 13186003. The reversal of 13185979 is 97958131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13185979 - 2³ = 13185971 is a prime.

It is not a weakly prime, because it can be changed into another prime (13185971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6592989 + 6592990.

It is an arithmetic number, because the mean of its divisors is an integer number (6592990).

Almost surely, 2^13185979 is an apocalyptic number.

13185979 is a deficient number, since it is larger than the sum of its proper divisors (1).

13185979 is an equidigital number, since it uses as much as digits as its factorization.

13185979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 43.

The square root of 13185979 is about 3631.2503356282. The cubic root of 13185979 is about 236.2494429967.

The spelling of 13185979 in words is "thirteen million, one hundred eighty-five thousand, nine hundred seventy-nine".