1231379 has 2 divisors, whose sum is σ = 1231380. Its totient is φ = 1231378.

The previous prime is 1231357. The next prime is 1231381. The reversal of 1231379 is 9731321.

It is a strong prime.

It is an emirp because it is prime and its reverse (9731321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231379 - 2²⁰ = 182803 is a prime.

Together with 1231381, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1231309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615689 + 615690.

It is an arithmetic number, because the mean of its divisors is an integer number (615690).

2^1231379 is an apocalyptic number.

1231379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231379 is an equidigital number, since it uses as much as digits as its factorization.

1231379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134, while the sum is 26.

The square root of 1231379 is about 1109.6751776984. The cubic root of 1231379 is about 107.1841531395.

The spelling of 1231379 in words is "one million, two hundred thirty-one thousand, three hundred seventy-nine".