12437321509 has 2 divisors, whose sum is σ = 12437321510. Its totient is φ = 12437321508.

The previous prime is 12437321483. The next prime is 12437321527. The reversal of 12437321509 is 90512373421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12237890625 + 199430884 = 110625^2 + 14122^2 .

It is a cyclic number.

It is not a de Polignac number, because 12437321509 - 2¹⁵ = 12437288741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12437321569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6218660754 + 6218660755.

It is an arithmetic number, because the mean of its divisors is an integer number (6218660755).

Almost surely, 2^12437321509 is an apocalyptic number.

It is an amenable number.

12437321509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12437321509 is an equidigital number, since it uses as much as digits as its factorization.

12437321509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 12437321509 in words is "twelve billion, four hundred thirty-seven million, three hundred twenty-one thousand, five hundred nine".