15441552121 has 2 divisors, whose sum is σ = 15441552122. Its totient is φ = 15441552120.

The previous prime is 15441552107. The next prime is 15441552131. The reversal of 15441552121 is 12125514451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15425640000 + 15912121 = 124200^2 + 3989^2 .

It is an emirp because it is prime and its reverse (12125514451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15441552121 - 2⁵ = 15441552089 is a prime.

It is not a weakly prime, because it can be changed into another prime (15441552101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7720776060 + 7720776061.

It is an arithmetic number, because the mean of its divisors is an integer number (7720776061).

Almost surely, 2^15441552121 is an apocalyptic number.

It is an amenable number.

15441552121 is a deficient number, since it is larger than the sum of its proper divisors (1).

15441552121 is an equidigital number, since it uses as much as digits as its factorization.

15441552121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8000, while the sum is 31.

The spelling of 15441552121 in words is "fifteen billion, four hundred forty-one million, five hundred fifty-two thousand, one hundred twenty-one".