685226687 has 2 divisors, whose sum is σ = 685226688. Its totient is φ = 685226686.

The previous prime is 685226683. The next prime is 685226693. The reversal of 685226687 is 786622586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685226687 - 2² = 685226683 is a prime.

It is a super-2 number, since 2×685226687² = 939071225153991938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685226683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342613343 + 342613344.

It is an arithmetic number, because the mean of its divisors is an integer number (342613344).

Almost surely, 2^685226687 is an apocalyptic number.

685226687 is a deficient number, since it is larger than the sum of its proper divisors (1).

685226687 is an equidigital number, since it uses as much as digits as its factorization.

685226687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 50.

The square root of 685226687 is about 26176.8349309079. The cubic root of 685226687 is about 881.6132112312.

The spelling of 685226687 in words is "six hundred eighty-five million, two hundred twenty-six thousand, six hundred eighty-seven".