15393121 has 2 divisors, whose sum is σ = 15393122. Its totient is φ = 15393120.

The previous prime is 15393061. The next prime is 15393137. The reversal of 15393121 is 12139351.

15393121 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., 11128896 + 4264225 = 3336^2 + 2065^2 .

It is a cyclic number.

It is not a de Polignac number, because 15393121 - 2²³ = 7004513 is a prime.

It is not a weakly prime, because it can be changed into another prime (15393181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7696560 + 7696561.

It is an arithmetic number, because the mean of its divisors is an integer number (7696561).

Almost surely, 2^15393121 is an apocalyptic number.

It is an amenable number.

15393121 is a deficient number, since it is larger than the sum of its proper divisors (1).

15393121 is an equidigital number, since it uses as much as digits as its factorization.

15393121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 25.

The square root of 15393121 is about 3923.4068104136. The cubic root of 15393121 is about 248.7571434697.

The spelling of 15393121 in words is "fifteen million, three hundred ninety-three thousand, one hundred twenty-one".