15748121 has 2 divisors, whose sum is σ = 15748122. Its totient is φ = 15748120.

The previous prime is 15748111. The next prime is 15748129. The reversal of 15748121 is 12184751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 26896 = 3965^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 15748121 - 2¹⁰ = 15747097 is a prime.

It is not a weakly prime, because it can be changed into another prime (15748129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7874060 + 7874061.

It is an arithmetic number, because the mean of its divisors is an integer number (7874061).

Almost surely, 2^15748121 is an apocalyptic number.

It is an amenable number.

15748121 is a deficient number, since it is larger than the sum of its proper divisors (1).

15748121 is an equidigital number, since it uses as much as digits as its factorization.

15748121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 29.

The square root of 15748121 is about 3968.3902277876. The cubic root of 15748121 is about 250.6549281118.

The spelling of 15748121 in words is "fifteen million, seven hundred forty-eight thousand, one hundred twenty-one".