12951437309 has 4 divisors (see below), whose sum is σ = 12951695904. Its totient is φ = 12951178716.

The previous prime is 12951437281. The next prime is 12951437311. The reversal of 12951437309 is 90373415921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12951437309 - 2²⁸ = 12683001853 is a prime.

It is a super-2 number, since 2×12951437309² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12951437309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12951437329) 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, 27407 + ... + 163260.

It is an arithmetic number, because the mean of its divisors is an integer number (3237923976).

Almost surely, 2^12951437309 is an apocalyptic number.

It is an amenable number.

12951437309 is a deficient number, since it is larger than the sum of its proper divisors (258595).

12951437309 is an equidigital number, since it uses as much as digits as its factorization.

12951437309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258594.

The product of its (nonzero) digits is 204120, while the sum is 44.

The spelling of 12951437309 in words is "twelve billion, nine hundred fifty-one million, four hundred thirty-seven thousand, three hundred nine".