687017131 has 2 divisors, whose sum is σ = 687017132. Its totient is φ = 687017130.

The previous prime is 687017117. The next prime is 687017237. The reversal of 687017131 is 131710786.

687017131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687017131 - 2⁵ = 687017099 is a prime.

It is a super-2 number, since 2×687017131² = 943985076574942322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (687017431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343508565 + 343508566.

It is an arithmetic number, because the mean of its divisors is an integer number (343508566).

Almost surely, 2^687017131 is an apocalyptic number.

687017131 is a deficient number, since it is larger than the sum of its proper divisors (1).

687017131 is an equidigital number, since it uses as much as digits as its factorization.

687017131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 687017131 is about 26211.0116363333. The cubic root of 687017131 is about 882.3804056465.

The spelling of 687017131 in words is "six hundred eighty-seven million, seventeen thousand, one hundred thirty-one".