1979851213 has 2 divisors, whose sum is σ = 1979851214. Its totient is φ = 1979851212.

The previous prime is 1979851123. The next prime is 1979851231. The reversal of 1979851213 is 3121589791.

Together with next prime (1979851231) it forms an Ormiston pair, because they use the same digits, order apart.

Together with previous prime (1979851123) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1966212964 + 13638249 = 44342^2 + 3693^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1979851213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1979854213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989925606 + 989925607.

It is an arithmetic number, because the mean of its divisors is an integer number (989925607).

Almost surely, 2^1979851213 is an apocalyptic number.

It is an amenable number.

1979851213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979851213 is an equidigital number, since it uses as much as digits as its factorization.

1979851213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 46.

The square root of 1979851213 is about 44495.5190215824. The cubic root of 1979851213 is about 1255.6757815037.

The spelling of 1979851213 in words is "one billion, nine hundred seventy-nine million, eight hundred fifty-one thousand, two hundred thirteen".