19108913 has 2 divisors, whose sum is σ = 19108914. Its totient is φ = 19108912.

The previous prime is 19108879. The next prime is 19108937. The reversal of 19108913 is 31980191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18601969 + 506944 = 4313^2 + 712^2 .

It is a cyclic number.

It is not a de Polignac number, because 19108913 - 2⁸ = 19108657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19108913.

It is not a weakly prime, because it can be changed into another prime (19108513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9554456 + 9554457.

It is an arithmetic number, because the mean of its divisors is an integer number (9554457).

Almost surely, 2^19108913 is an apocalyptic number.

It is an amenable number.

19108913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19108913 is an equidigital number, since it uses as much as digits as its factorization.

19108913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 19108913 is about 4371.3742690371. The cubic root of 19108913 is about 267.3490597496.

The spelling of 19108913 in words is "nineteen million, one hundred eight thousand, nine hundred thirteen".