13123817 has 6 divisors (see below), whose sum is σ = 15266538. Its totient is φ = 11248944.

The previous prime is 13123811. The next prime is 13123841. The reversal of 13123817 is 71832131.

It can be written as a sum of positive squares in only one way, i.e., 7722841 + 5400976 = 2779^2 + 2324^2 .

It is not a de Polignac number, because 13123817 - 2¹⁴ = 13107433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13123811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 133868 + ... + 133965.

It is an arithmetic number, because the mean of its divisors is an integer number (2544423).

Almost surely, 2^13123817 is an apocalyptic number.

It is an amenable number.

13123817 is a deficient number, since it is larger than the sum of its proper divisors (2142721).

13123817 is an equidigital number, since it uses as much as digits as its factorization.

13123817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267847 (or 267840 counting only the distinct ones).

The product of its digits is 1008, while the sum is 26.

The square root of 13123817 is about 3622.6809133568. The cubic root of 13123817 is about 235.8776117782.

Adding to 13123817 its reverse (71832131), we get a palindrome (84955948).

The spelling of 13123817 in words is "thirteen million, one hundred twenty-three thousand, eight hundred seventeen".