15531332489 has 2 divisors, whose sum is σ = 15531332490. Its totient is φ = 15531332488.

The previous prime is 15531332441. The next prime is 15531332603. The reversal of 15531332489 is 98423313551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9272149264 + 6259183225 = 96292^2 + 79115^2 .

It is a cyclic number.

It is not a de Polignac number, because 15531332489 - 2²⁸ = 15262897033 is a prime.

It is not a weakly prime, because it can be changed into another prime (15531332389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7765666244 + 7765666245.

It is an arithmetic number, because the mean of its divisors is an integer number (7765666245).

Almost surely, 2^15531332489 is an apocalyptic number.

It is an amenable number.

15531332489 is a deficient number, since it is larger than the sum of its proper divisors (1).

15531332489 is an equidigital number, since it uses as much as digits as its factorization.

15531332489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 44.

The spelling of 15531332489 in words is "fifteen billion, five hundred thirty-one million, three hundred thirty-two thousand, four hundred eighty-nine".