15231121441 has 4 divisors (see below), whose sum is σ = 15234410772. Its totient is φ = 15227832112.

The previous prime is 15231121429. The next prime is 15231121471. The reversal of 15231121441 is 14412113251.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14412113251 = 2081 ⋅6925571.

It can be written as a sum of positive squares in 2 ways, for example, as 4398475041 + 10832646400 = 66321^2 + 104080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15231121441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15231121471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1637710 + ... + 1646983.

It is an arithmetic number, because the mean of its divisors is an integer number (3808602693).

Almost surely, 2^15231121441 is an apocalyptic number.

It is an amenable number.

15231121441 is a deficient number, since it is larger than the sum of its proper divisors (3289331).

15231121441 is an equidigital number, since it uses as much as digits as its factorization.

15231121441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289330.

The product of its digits is 960, while the sum is 25.

Adding to 15231121441 its reverse (14412113251), we get a palindrome (29643234692).

The spelling of 15231121441 in words is "fifteen billion, two hundred thirty-one million, one hundred twenty-one thousand, four hundred forty-one".