681583361 has 4 divisors (see below), whose sum is σ = 681650112. Its totient is φ = 681516612.

The previous prime is 681583351. The next prime is 681583373. The reversal of 681583361 is 163385186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 163385186 = 2 ⋅81692593.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681583361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681583321) 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, 14501 + ... + 39666.

It is an arithmetic number, because the mean of its divisors is an integer number (170412528).

Almost surely, 2^681583361 is an apocalyptic number.

It is an amenable number.

681583361 is a deficient number, since it is larger than the sum of its proper divisors (66751).

681583361 is a wasteful number, since it uses less digits than its factorization.

681583361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66750.

The product of its digits is 103680, while the sum is 41.

The square root of 681583361 is about 26107.1515298012. The cubic root of 681583361 is about 880.0479317040.

The spelling of 681583361 in words is "six hundred eighty-one million, five hundred eighty-three thousand, three hundred sixty-one".