681811775 has 12 divisors (see below), whose sum is σ = 895179312. Its totient is φ = 513363840.

The previous prime is 681811771. The next prime is 681811777. The reversal of 681811775 is 577118186.

It is not a de Polignac number, because 681811775 - 2² = 681811771 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 (681811771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 801707 + ... + 802556.

It is an arithmetic number, because the mean of its divisors is an integer number (74598276).

Almost surely, 2^681811775 is an apocalyptic number.

681811775 is a deficient number, since it is larger than the sum of its proper divisors (213367537).

681811775 is a wasteful number, since it uses less digits than its factorization.

681811775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604290 (or 1604285 counting only the distinct ones).

The product of its digits is 94080, while the sum is 44.

The square root of 681811775 is about 26111.5257118384. The cubic root of 681811775 is about 880.1462287131.

The spelling of 681811775 in words is "six hundred eighty-one million, eight hundred eleven thousand, seven hundred seventy-five".