681193489 has 8 divisors (see below), whose sum is σ = 694245728. Its totient is φ = 668226240.

The previous prime is 681193483. The next prime is 681193511. The reversal of 681193489 is 984391186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681193489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681193483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4947 + ... + 37240.

It is an arithmetic number, because the mean of its divisors is an integer number (86780716).

Almost surely, 2^681193489 is an apocalyptic number.

It is an amenable number.

681193489 is a deficient number, since it is larger than the sum of its proper divisors (13052239).

681193489 is a wasteful number, since it uses less digits than its factorization.

681193489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42495.

The product of its digits is 373248, while the sum is 49.

The square root of 681193489 is about 26099.6836954014. The cubic root of 681193489 is about 879.8801011750.

The spelling of 681193489 in words is "six hundred eighty-one million, one hundred ninety-three thousand, four hundred eighty-nine".