15917243 has 2 divisors, whose sum is σ = 15917244. Its totient is φ = 15917242.

The previous prime is 15917221. The next prime is 15917249. The reversal of 15917243 is 34271951.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15917243 is a prime.

It is not a weakly prime, because it can be changed into another prime (15917249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7958621 + 7958622.

It is an arithmetic number, because the mean of its divisors is an integer number (7958622).

Almost surely, 2^15917243 is an apocalyptic number.

15917243 is a deficient number, since it is larger than the sum of its proper divisors (1).

15917243 is an equidigital number, since it uses as much as digits as its factorization.

15917243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 15917243 is about 3989.6419638860. The cubic root of 15917243 is about 251.5490117609.

The spelling of 15917243 in words is "fifteen million, nine hundred seventeen thousand, two hundred forty-three".