13123919 has 2 divisors, whose sum is σ = 13123920. Its totient is φ = 13123918.

The previous prime is 13123909. The next prime is 13123931. The reversal of 13123919 is 91932131.

It is a weak prime.

It is an emirp because it is prime and its reverse (91932131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13123919 is a prime.

It is a super-2 number, since 2×13123919² = 344474499837122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13123891 and 13123900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13123909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6561959 + 6561960.

It is an arithmetic number, because the mean of its divisors is an integer number (6561960).

Almost surely, 2^13123919 is an apocalyptic number.

13123919 is a deficient number, since it is larger than the sum of its proper divisors (1).

13123919 is an equidigital number, since it uses as much as digits as its factorization.

13123919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 29.

The square root of 13123919 is about 3622.6949913014. The cubic root of 13123919 is about 235.8782228670.

The spelling of 13123919 in words is "thirteen million, one hundred twenty-three thousand, nine hundred nineteen".