1171979 has 2 divisors, whose sum is σ = 1171980. Its totient is φ = 1171978.

The previous prime is 1171969. The next prime is 1171981. The reversal of 1171979 is 9791711.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1171979 is a prime.

Together with 1171981, 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 (1171969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585989 + 585990.

It is an arithmetic number, because the mean of its divisors is an integer number (585990).

2^1171979 is an apocalyptic number.

1171979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171979 is an equidigital number, since it uses as much as digits as its factorization.

1171979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3969, while the sum is 35.

The square root of 1171979 is about 1082.5797892072. The cubic root of 1171979 is about 105.4322018970.

The spelling of 1171979 in words is "one million, one hundred seventy-one thousand, nine hundred seventy-nine".