1231131379 has 2 divisors, whose sum is σ = 1231131380. Its totient is φ = 1231131378.

The previous prime is 1231131331. The next prime is 1231131383. The reversal of 1231131379 is 9731311321.

It is a strong prime.

It is an emirp because it is prime and its reverse (9731311321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231131379 - 2¹¹ = 1231129331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231131379.

It is not a weakly prime, because it can be changed into another prime (1231131679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615565689 + 615565690.

It is an arithmetic number, because the mean of its divisors is an integer number (615565690).

Almost surely, 2^1231131379 is an apocalyptic number.

1231131379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231131379 is an equidigital number, since it uses as much as digits as its factorization.

1231131379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 31.

The square root of 1231131379 is about 35087.4817990690. The cubic root of 1231131379 is about 1071.7696801708.

The spelling of 1231131379 in words is "one billion, two hundred thirty-one million, one hundred thirty-one thousand, three hundred seventy-nine".