15117287 has 2 divisors, whose sum is σ = 15117288. Its totient is φ = 15117286.

The previous prime is 15117251. The next prime is 15117307. The reversal of 15117287 is 78271151.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15117287 - 2¹² = 15113191 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15117227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7558643 + 7558644.

It is an arithmetic number, because the mean of its divisors is an integer number (7558644).

Almost surely, 2^15117287 is an apocalyptic number.

15117287 is a deficient number, since it is larger than the sum of its proper divisors (1).

15117287 is an equidigital number, since it uses as much as digits as its factorization.

15117287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3920, while the sum is 32.

The square root of 15117287 is about 3888.0955492374. The cubic root of 15117287 is about 247.2623273591.

The spelling of 15117287 in words is "fifteen million, one hundred seventeen thousand, two hundred eighty-seven".