1311422531509 has 2 divisors, whose sum is σ = 1311422531510. Its totient is φ = 1311422531508.

The previous prime is 1311422531483. The next prime is 1311422531543. The reversal of 1311422531509 is 9051352241131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1159720071409 + 151702460100 = 1076903^2 + 389490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311422531509 - 2¹⁵ = 1311422498741 is a prime.

It is a super-2 number, since 2×1311422531509² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311422531609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655711265754 + 655711265755.

It is an arithmetic number, because the mean of its divisors is an integer number (655711265755).

Almost surely, 2^{1311422531509} is an apocalyptic number.

It is an amenable number.

1311422531509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311422531509 is an equidigital number, since it uses as much as digits as its factorization.

1311422531509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 1311422531509 in words is "one trillion, three hundred eleven billion, four hundred twenty-two million, five hundred thirty-one thousand, five hundred nine".