1979911 has 2 divisors, whose sum is σ = 1979912. Its totient is φ = 1979910.

The previous prime is 1979899. The next prime is 1979941. The reversal of 1979911 is 1199791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1979911 - 2⁹ = 1979399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1979941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989955 + 989956.

It is an arithmetic number, because the mean of its divisors is an integer number (989956).

2^1979911 is an apocalyptic number.

1979911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979911 is an equidigital number, since it uses as much as digits as its factorization.

1979911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5103, while the sum is 37.

The square root of 1979911 is about 1407.0931028187. The cubic root of 1979911 is about 125.5688420893.

The spelling of 1979911 in words is "one million, nine hundred seventy-nine thousand, nine hundred eleven".