15217897 has 2 divisors, whose sum is σ = 15217898. Its totient is φ = 15217896.

The previous prime is 15217883. The next prime is 15217901. The reversal of 15217897 is 79871251.

15217897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13039321 + 2178576 = 3611^2 + 1476^2 .

It is an emirp because it is prime and its reverse (79871251) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15217897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15217997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7608948 + 7608949.

It is an arithmetic number, because the mean of its divisors is an integer number (7608949).

Almost surely, 2^15217897 is an apocalyptic number.

It is an amenable number.

15217897 is a deficient number, since it is larger than the sum of its proper divisors (1).

15217897 is an equidigital number, since it uses as much as digits as its factorization.

15217897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 40.

The square root of 15217897 is about 3901.0123045179. The cubic root of 15217897 is about 247.8096495042.

The spelling of 15217897 in words is "fifteen million, two hundred seventeen thousand, eight hundred ninety-seven".