15973231009 has 6 divisors (see below), whose sum is σ = 16088992530. Its totient is φ = 15858296496.

The previous prime is 15973231003. The next prime is 15973231019. The reversal of 15973231009 is 90013237951.

It can be written as a sum of positive squares in only one way, i.e., 14860341409 + 1112889600 = 121903^2 + 33360^2 .

It is a de Polignac number, because none of the positive numbers 2^k-15973231009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15973231003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 394044 + ... + 432685.

It is an arithmetic number, because the mean of its divisors is an integer number (2681498755).

Almost surely, 2^15973231009 is an apocalyptic number.

It is an amenable number.

15973231009 is a deficient number, since it is larger than the sum of its proper divisors (115761521).

15973231009 is an frugal number, since it uses more digits than its factorization.

15973231009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827007 (or 826868 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 40.

The spelling of 15973231009 in words is "fifteen billion, nine hundred seventy-three million, two hundred thirty-one thousand, nine".