681748373 has 4 divisors (see below), whose sum is σ = 703740288. Its totient is φ = 659756460.

The previous prime is 681748351. The next prime is 681748391. The reversal of 681748373 is 373847186.

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 not a de Polignac number, because 681748373 - 2²⁰ = 680699797 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 (681748303) 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, 10995911 + ... + 10995972.

It is an arithmetic number, because the mean of its divisors is an integer number (175935072).

Almost surely, 2^681748373 is an apocalyptic number.

It is an amenable number.

681748373 is a deficient number, since it is larger than the sum of its proper divisors (21991915).

681748373 is a wasteful number, since it uses less digits than its factorization.

681748373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21991914.

The product of its digits is 677376, while the sum is 47.

The square root of 681748373 is about 26110.3116220393. The cubic root of 681748373 is about 880.1189461291.

The spelling of 681748373 in words is "six hundred eighty-one million, seven hundred forty-eight thousand, three hundred seventy-three".