681789901 has 8 divisors (see below), whose sum is σ = 772879520. Its totient is φ = 596220912.

The previous prime is 681789869. The next prime is 681789917. The reversal of 681789901 is 109987186.

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

It is not a de Polignac number, because 681789901 - 2⁵ = 681789869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681789961) 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, 1379895 + ... + 1380388.

It is an arithmetic number, because the mean of its divisors is an integer number (96609940).

Almost surely, 2^681789901 is an apocalyptic number.

It is an amenable number.

681789901 is a deficient number, since it is larger than the sum of its proper divisors (91089619).

681789901 is a wasteful number, since it uses less digits than its factorization.

681789901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760315.

The product of its (nonzero) digits is 217728, while the sum is 49.

The square root of 681789901 is about 26111.1068512999. The cubic root of 681789901 is about 880.1368162793.

The spelling of 681789901 in words is "six hundred eighty-one million, seven hundred eighty-nine thousand, nine hundred one".