687691143 has 6 divisors (see below), whose sum is σ = 993331664. Its totient is φ = 458460756.

The previous prime is 687691133. The next prime is 687691153. The reversal of 687691143 is 341196786.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (687691133) and next prime (687691153).

It is not a de Polignac number, because 687691143 - 2⁴ = 687691127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687691133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38205055 + ... + 38205072.

Almost surely, 2^687691143 is an apocalyptic number.

687691143 is a deficient number, since it is larger than the sum of its proper divisors (305640521).

687691143 is a wasteful number, since it uses less digits than its factorization.

687691143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76410133 (or 76410130 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 687691143 is about 26223.8659049348. The cubic root of 687691143 is about 882.6688703581.

The spelling of 687691143 in words is "six hundred eighty-seven million, six hundred ninety-one thousand, one hundred forty-three".