15555247 has 2 divisors, whose sum is σ = 15555248. Its totient is φ = 15555246.

The previous prime is 15555229. The next prime is 15555251. The reversal of 15555247 is 74255551.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15555247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15555217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7777623 + 7777624.

It is an arithmetic number, because the mean of its divisors is an integer number (7777624).

Almost surely, 2^15555247 is an apocalyptic number.

15555247 is a deficient number, since it is larger than the sum of its proper divisors (1).

15555247 is an equidigital number, since it uses as much as digits as its factorization.

15555247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35000, while the sum is 34.

The square root of 15555247 is about 3944.0140719830. The cubic root of 15555247 is about 249.6274290393.

The spelling of 15555247 in words is "fifteen million, five hundred fifty-five thousand, two hundred forty-seven".