15668413 has 2 divisors, whose sum is σ = 15668414. Its totient is φ = 15668412.

The previous prime is 15668377. The next prime is 15668431. The reversal of 15668413 is 31486651.

It is a happy number.

Together with next prime (15668431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14462809 + 1205604 = 3803^2 + 1098^2 .

It is a cyclic number.

It is not a de Polignac number, because 15668413 - 2¹³ = 15660221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15668473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7834206 + 7834207.

It is an arithmetic number, because the mean of its divisors is an integer number (7834207).

Almost surely, 2^15668413 is an apocalyptic number.

It is an amenable number.

15668413 is a deficient number, since it is larger than the sum of its proper divisors (1).

15668413 is an equidigital number, since it uses as much as digits as its factorization.

15668413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 15668413 is about 3958.3346245612. The cubic root of 15668413 is about 250.2313218947.

The spelling of 15668413 in words is "fifteen million, six hundred sixty-eight thousand, four hundred thirteen".