1312124040509 has 2 divisors, whose sum is σ = 1312124040510. Its totient is φ = 1312124040508.

The previous prime is 1312124040499. The next prime is 1312124040523. The reversal of 1312124040509 is 9050404212131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1189729018009 + 122395022500 = 1090747^2 + 349850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312124040509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312124040809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656062020254 + 656062020255.

It is an arithmetic number, because the mean of its divisors is an integer number (656062020255).

Almost surely, 2^{1312124040509} is an apocalyptic number.

It is an amenable number.

1312124040509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312124040509 is an equidigital number, since it uses as much as digits as its factorization.

1312124040509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 1312124040509 in words is "one trillion, three hundred twelve billion, one hundred twenty-four million, forty thousand, five hundred nine".