15256993 has 2 divisors, whose sum is σ = 15256994. Its totient is φ = 15256992.

The previous prime is 15256937. The next prime is 15257009. The reversal of 15256993 is 39965251.

It is a happy number.

15256993 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., 12271009 + 2985984 = 3503^2 + 1728^2 .

It is an emirp because it is prime and its reverse (39965251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15256993 - 2⁹ = 15256481 is a prime.

It is not a weakly prime, because it can be changed into another prime (15256903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7628496 + 7628497.

It is an arithmetic number, because the mean of its divisors is an integer number (7628497).

Almost surely, 2^15256993 is an apocalyptic number.

It is an amenable number.

15256993 is a deficient number, since it is larger than the sum of its proper divisors (1).

15256993 is an equidigital number, since it uses as much as digits as its factorization.

15256993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 40.

The square root of 15256993 is about 3906.0200972345. The cubic root of 15256993 is about 248.0216823308.

The spelling of 15256993 in words is "fifteen million, two hundred fifty-six thousand, nine hundred ninety-three".