1131204399509 has 2 divisors, whose sum is σ = 1131204399510. Its totient is φ = 1131204399508.

The previous prime is 1131204399467. The next prime is 1131204399541. The reversal of 1131204399509 is 9059934021311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1100936055025 + 30268344484 = 1049255^2 + 173978^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131204399509 - 2⁸ = 1131204399253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131204399599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565602199754 + 565602199755.

It is an arithmetic number, because the mean of its divisors is an integer number (565602199755).

Almost surely, 2^{1131204399509} is an apocalyptic number.

It is an amenable number.

1131204399509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131204399509 is an equidigital number, since it uses as much as digits as its factorization.

1131204399509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 47.

The spelling of 1131204399509 in words is "one trillion, one hundred thirty-one billion, two hundred four million, three hundred ninety-nine thousand, five hundred nine".