681797041 has 4 divisors (see below), whose sum is σ = 681853284. Its totient is φ = 681740800.

The previous prime is 681797023. The next prime is 681797063. The reversal of 681797041 is 140797186.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 140797186 = 2 ⋅70398593.

It can be written as a sum of positive squares in 2 ways, for example, as 171714816 + 510082225 = 13104^2 + 22585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681797041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681797021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600 + ... + 36961.

It is an arithmetic number, because the mean of its divisors is an integer number (170463321).

Almost surely, 2^681797041 is an apocalyptic number.

It is an amenable number.

681797041 is a deficient number, since it is larger than the sum of its proper divisors (56243).

681797041 is a wasteful number, since it uses less digits than its factorization.

681797041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56242.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 681797041 is about 26111.2435743685. The cubic root of 681797041 is about 880.1398886603.

The spelling of 681797041 in words is "six hundred eighty-one million, seven hundred ninety-seven thousand, forty-one".