15241921 has 2 divisors, whose sum is σ = 15241922. Its totient is φ = 15241920.

The previous prime is 15241903. The next prime is 15241927. The reversal of 15241921 is 12914251.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7756225 + 7485696 = 2785^2 + 2736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15241921 is a prime.

It is not a weakly prime, because it can be changed into another prime (15241927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7620960 + 7620961.

It is an arithmetic number, because the mean of its divisors is an integer number (7620961).

Almost surely, 2^15241921 is an apocalyptic number.

It is an amenable number.

15241921 is a deficient number, since it is larger than the sum of its proper divisors (1).

15241921 is an equidigital number, since it uses as much as digits as its factorization.

15241921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 25.

The square root of 15241921 is about 3904.0902909641. The cubic root of 15241921 is about 247.9399839598.

The spelling of 15241921 in words is "fifteen million, two hundred forty-one thousand, nine hundred twenty-one".