15231144109 has 2 divisors, whose sum is σ = 15231144110. Its totient is φ = 15231144108.

The previous prime is 15231144083. The next prime is 15231144113. The reversal of 15231144109 is 90144113251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9413268484 + 5817875625 = 97022^2 + 76275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15231144109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15231144179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7615572054 + 7615572055.

It is an arithmetic number, because the mean of its divisors is an integer number (7615572055).

Almost surely, 2^15231144109 is an apocalyptic number.

It is an amenable number.

15231144109 is a deficient number, since it is larger than the sum of its proper divisors (1).

15231144109 is an equidigital number, since it uses as much as digits as its factorization.

15231144109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 15231144109 in words is "fifteen billion, two hundred thirty-one million, one hundred forty-four thousand, one hundred nine".