1687648507 has 2 divisors, whose sum is σ = 1687648508. Its totient is φ = 1687648506.

The previous prime is 1687648447. The next prime is 1687648513. The reversal of 1687648507 is 7058467861.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1687648507 is a prime.

It is not a weakly prime, because it can be changed into another prime (1687648537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843824253 + 843824254.

It is an arithmetic number, because the mean of its divisors is an integer number (843824254).

Almost surely, 2^1687648507 is an apocalyptic number.

1687648507 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687648507 is an equidigital number, since it uses as much as digits as its factorization.

1687648507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The square root of 1687648507 is about 41080.9993427619. Note that the first 3 decimals coincide. The cubic root of 1687648507 is about 1190.5857124210.

The spelling of 1687648507 in words is "one billion, six hundred eighty-seven million, six hundred forty-eight thousand, five hundred seven".