681773911 has 16 divisors (see below), whose sum is σ = 845526528. Its totient is φ = 535298400.

The previous prime is 681773893. The next prime is 681773921. The reversal of 681773911 is 119377186.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-681773911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681773921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16675 + ... + 40516.

It is an arithmetic number, because the mean of its divisors is an integer number (52845408).

Almost surely, 2^681773911 is an apocalyptic number.

681773911 is a deficient number, since it is larger than the sum of its proper divisors (163752617).

681773911 is a wasteful number, since it uses less digits than its factorization.

681773911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57342.

The product of its digits is 63504, while the sum is 43.

The square root of 681773911 is about 26110.8006579653. The cubic root of 681773911 is about 880.1299356172.

The spelling of 681773911 in words is "six hundred eighty-one million, seven hundred seventy-three thousand, nine hundred eleven".