15551597 has 2 divisors, whose sum is σ = 15551598. Its totient is φ = 15551596.

The previous prime is 15551579. The next prime is 15551603. The reversal of 15551597 is 79515551.

Together with previous prime (15551579) 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., 12630916 + 2920681 = 3554^2 + 1709^2 .

It is a cyclic number.

It is not a de Polignac number, because 15551597 - 2⁶ = 15551533 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15551597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15551537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7775798 + 7775799.

It is an arithmetic number, because the mean of its divisors is an integer number (7775799).

Almost surely, 2^15551597 is an apocalyptic number.

It is an amenable number.

15551597 is a deficient number, since it is larger than the sum of its proper divisors (1).

15551597 is an equidigital number, since it uses as much as digits as its factorization.

15551597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39375, while the sum is 38.

The square root of 15551597 is about 3943.5513182917. The cubic root of 15551597 is about 249.6079026936.

The spelling of 15551597 in words is "fifteen million, five hundred fifty-one thousand, five hundred ninety-seven".