687122331 has 16 divisors (see below), whose sum is σ = 1047514368. Its totient is φ = 392464800.

The previous prime is 687122311. The next prime is 687122333. The reversal of 687122331 is 133221786.

It is not a de Polignac number, because 687122331 - 2⁷ = 687122203 is a prime.

It is a super-2 number, since 2×687122331² = 944274195517747122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 687122292 and 687122301.

It is not an unprimeable number, because it can be changed into a prime (687122333) 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 15 ways as a sum of consecutive naturals, for example, 51361 + ... + 63341.

It is an arithmetic number, because the mean of its divisors is an integer number (65469648).

Almost surely, 2^687122331 is an apocalyptic number.

687122331 is a deficient number, since it is larger than the sum of its proper divisors (360392037).

687122331 is a wasteful number, since it uses less digits than its factorization.

687122331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14722.

The product of its digits is 12096, while the sum is 33.

The square root of 687122331 is about 26213.0183496674. The cubic root of 687122331 is about 882.4254417292.

The spelling of 687122331 in words is "six hundred eighty-seven million, one hundred twenty-two thousand, three hundred thirty-one".