1687242079 has 2 divisors, whose sum is σ = 1687242080. Its totient is φ = 1687242078.

The previous prime is 1687242059. The next prime is 1687242097. The reversal of 1687242079 is 9702427861.

Together with next prime (1687242097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1687242079 - 2¹¹ = 1687240031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1687242059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843621039 + 843621040.

It is an arithmetic number, because the mean of its divisors is an integer number (843621040).

Almost surely, 2^1687242079 is an apocalyptic number.

1687242079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687242079 is an equidigital number, since it uses as much as digits as its factorization.

1687242079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 1687242079 is about 41076.0523784845. The cubic root of 1687242079 is about 1190.4901304684.

The spelling of 1687242079 in words is "one billion, six hundred eighty-seven million, two hundred forty-two thousand, seventy-nine".