15240257 has 2 divisors, whose sum is σ = 15240258. Its totient is φ = 15240256.

The previous prime is 15240229. The next prime is 15240259. The reversal of 15240257 is 75204251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14258176 + 982081 = 3776^2 + 991^2 .

It is a cyclic number.

It is not a de Polignac number, because 15240257 - 2¹² = 15236161 is a prime.

Together with 15240259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15240259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7620128 + 7620129.

It is an arithmetic number, because the mean of its divisors is an integer number (7620129).

Almost surely, 2^15240257 is an apocalyptic number.

It is an amenable number.

15240257 is a deficient number, since it is larger than the sum of its proper divisors (1).

15240257 is an equidigital number, since it uses as much as digits as its factorization.

15240257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 15240257 is about 3903.8771753220. The cubic root of 15240257 is about 247.9309608813.

The spelling of 15240257 in words is "fifteen million, two hundred forty thousand, two hundred fifty-seven".