3931686287 has 4 divisors (see below), whose sum is σ = 3970613976. Its totient is φ = 3892758600.

The previous prime is 3931686257. The next prime is 3931686289. The reversal of 3931686287 is 7826861393.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3931686287 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 (3931686289) 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 3 ways as a sum of consecutive naturals, for example, 19463693 + ... + 19463894.

It is an arithmetic number, because the mean of its divisors is an integer number (992653494).

Almost surely, 2^3931686287 is an apocalyptic number.

3931686287 is a deficient number, since it is larger than the sum of its proper divisors (38927689).

3931686287 is a wasteful number, since it uses less digits than its factorization.

3931686287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38927688.

The product of its digits is 2612736, while the sum is 53.

The square root of 3931686287 is about 62703.1601037779. The cubic root of 3931686287 is about 1578.3123419575.

The spelling of 3931686287 in words is "three billion, nine hundred thirty-one million, six hundred eighty-six thousand, two hundred eighty-seven".