681357289 has 4 divisors (see below), whose sum is σ = 686259280. Its totient is φ = 676455300.

The previous prime is 681357283. The next prime is 681357301. The reversal of 681357289 is 982753186.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681357289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681357283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2450787 + ... + 2451064.

It is an arithmetic number, because the mean of its divisors is an integer number (171564820).

Almost surely, 2^681357289 is an apocalyptic number.

It is an amenable number.

681357289 is a deficient number, since it is larger than the sum of its proper divisors (4901991).

681357289 is a wasteful number, since it uses less digits than its factorization.

681357289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4901990.

The product of its digits is 725760, while the sum is 49.

The square root of 681357289 is about 26102.8214758482. The cubic root of 681357289 is about 879.9506209379.

The spelling of 681357289 in words is "six hundred eighty-one million, three hundred fifty-seven thousand, two hundred eighty-nine".