681863741 has 4 divisors (see below), whose sum is σ = 734314812. Its totient is φ = 629412672.

The previous prime is 681863723. The next prime is 681863753. The reversal of 681863741 is 147368186.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 191241241 + 490622500 = 13829^2 + 22150^2 .

It is a cyclic number.

It is not a de Polignac number, because 681863741 - 2¹⁸ = 681601597 is a prime.

It is a super-2 number, since 2×681863741² = 929876322581030162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 681863692 and 681863701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681893741) 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, 26225516 + ... + 26225541.

It is an arithmetic number, because the mean of its divisors is an integer number (183578703).

Almost surely, 2^681863741 is an apocalyptic number.

It is an amenable number.

681863741 is a deficient number, since it is larger than the sum of its proper divisors (52451071).

681863741 is a wasteful number, since it uses less digits than its factorization.

681863741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52451070.

The product of its digits is 193536, while the sum is 44.

The square root of 681863741 is about 26112.5207706954. The cubic root of 681863741 is about 880.1685889981.

The spelling of 681863741 in words is "six hundred eighty-one million, eight hundred sixty-three thousand, seven hundred forty-one".