15245250121 has 2 divisors, whose sum is σ = 15245250122. Its totient is φ = 15245250120.

The previous prime is 15245250073. The next prime is 15245250161. The reversal of 15245250121 is 12105254251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14121994896 + 1123255225 = 118836^2 + 33515^2 .

It is a cyclic number.

It is not a de Polignac number, because 15245250121 - 2²³ = 15236861513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15245250121.

It is not a weakly prime, because it can be changed into another prime (15245250161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7622625060 + 7622625061.

It is an arithmetic number, because the mean of its divisors is an integer number (7622625061).

Almost surely, 2^15245250121 is an apocalyptic number.

It is an amenable number.

15245250121 is a deficient number, since it is larger than the sum of its proper divisors (1).

15245250121 is an equidigital number, since it uses as much as digits as its factorization.

15245250121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 15245250121 in words is "fifteen billion, two hundred forty-five million, two hundred fifty thousand, one hundred twenty-one".