681312445 has 16 divisors (see below), whose sum is σ = 892608192. Its totient is φ = 495106560.

The previous prime is 681312427. The next prime is 681312461. The reversal of 681312445 is 544213186.

It is a de Polignac number, because none of the positive numbers 2^k-681312445 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681312445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77389 + ... + 85741.

It is an arithmetic number, because the mean of its divisors is an integer number (55788012).

Almost surely, 2^681312445 is an apocalyptic number.

It is an amenable number.

681312445 is a deficient number, since it is larger than the sum of its proper divisors (211295747).

681312445 is a wasteful number, since it uses less digits than its factorization.

681312445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9852.

The product of its digits is 23040, while the sum is 34.

The square root of 681312445 is about 26101.9624741129. The cubic root of 681312445 is about 879.9313156620.

The spelling of 681312445 in words is "six hundred eighty-one million, three hundred twelve thousand, four hundred forty-five".