1687279679 has 2 divisors, whose sum is σ = 1687279680. Its totient is φ = 1687279678.

The previous prime is 1687279673. The next prime is 1687279681. The reversal of 1687279679 is 9769727861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1687279679 - 2²⁰ = 1686231103 is a prime.

Together with 1687279681, 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 (1687279673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843639839 + 843639840.

It is an arithmetic number, because the mean of its divisors is an integer number (843639840).

Almost surely, 2^1687279679 is an apocalyptic number.

1687279679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687279679 is an equidigital number, since it uses as much as digits as its factorization.

1687279679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16003008, while the sum is 62.

The square root of 1687279679 is about 41076.5100635387. The cubic root of 1687279679 is about 1190.4989737156.

The spelling of 1687279679 in words is "one billion, six hundred eighty-seven million, two hundred seventy-nine thousand, six hundred seventy-nine".