1687548013 has 2 divisors, whose sum is σ = 1687548014. Its totient is φ = 1687548012.

The previous prime is 1687548011. The next prime is 1687548043. The reversal of 1687548013 is 3108457861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1474329609 + 213218404 = 38397^2 + 14602^2 .

It is a cyclic number.

It is not a de Polignac number, because 1687548013 - 2¹ = 1687548011 is a prime.

Together with 1687548011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1687548011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843774006 + 843774007.

It is an arithmetic number, because the mean of its divisors is an integer number (843774007).

Almost surely, 2^1687548013 is an apocalyptic number.

It is an amenable number.

1687548013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687548013 is an equidigital number, since it uses as much as digits as its factorization.

1687548013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 1687548013 is about 41079.7762043563. The cubic root of 1687548013 is about 1190.5620801115.

The spelling of 1687548013 in words is "one billion, six hundred eighty-seven million, five hundred forty-eight thousand, thirteen".