1131309979 has 2 divisors, whose sum is σ = 1131309980. Its totient is φ = 1131309978.

The previous prime is 1131309973. The next prime is 1131309983. The reversal of 1131309979 is 9799031311.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9799031311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131309979 - 2²⁹ = 594439067 is a prime.

It is not a weakly prime, because it can be changed into another prime (1131309973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565654989 + 565654990.

It is an arithmetic number, because the mean of its divisors is an integer number (565654990).

Almost surely, 2^1131309979 is an apocalyptic number.

1131309979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131309979 is an equidigital number, since it uses as much as digits as its factorization.

1131309979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45927, while the sum is 43.

The square root of 1131309979 is about 33634.9517466578. The cubic root of 1131309979 is about 1041.9827740566.

The spelling of 1131309979 in words is "one billion, one hundred thirty-one million, three hundred nine thousand, nine hundred seventy-nine".