1679985191 has 2 divisors, whose sum is σ = 1679985192. Its totient is φ = 1679985190.

The previous prime is 1679985161. The next prime is 1679985193. The reversal of 1679985191 is 1915899761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1679985191 - 2²² = 1675790887 is a prime.

Together with 1679985193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1679985193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839992595 + 839992596.

It is an arithmetic number, because the mean of its divisors is an integer number (839992596).

Almost surely, 2^1679985191 is an apocalyptic number.

1679985191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1679985191 is an equidigital number, since it uses as much as digits as its factorization.

1679985191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 56.

The square root of 1679985191 is about 40987.6224121380. The cubic root of 1679985191 is about 1188.7808975447.

The spelling of 1679985191 in words is "one billion, six hundred seventy-nine million, nine hundred eighty-five thousand, one hundred ninety-one".