11309999549 has 2 divisors, whose sum is σ = 11309999550. Its totient is φ = 11309999548.

The previous prime is 11309999453. The next prime is 11309999579. The reversal of 11309999549 is 94599990311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9934108900 + 1375890649 = 99670^2 + 37093^2 .

It is a cyclic number.

It is not a de Polignac number, because 11309999549 - 2⁸ = 11309999293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11309999579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5654999774 + 5654999775.

It is an arithmetic number, because the mean of its divisors is an integer number (5654999775).

Almost surely, 2^11309999549 is an apocalyptic number.

It is an amenable number.

11309999549 is a deficient number, since it is larger than the sum of its proper divisors (1).

11309999549 is an equidigital number, since it uses as much as digits as its factorization.

11309999549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3542940, while the sum is 59.

The spelling of 11309999549 in words is "eleven billion, three hundred nine million, nine hundred ninety-nine thousand, five hundred forty-nine".