681946585 has 8 divisors (see below), whose sum is σ = 866473416. Its totient is φ = 513465600.

The previous prime is 681946583. The next prime is 681946607. The reversal of 681946585 is 585649186.

It can be written as a sum of positive squares in 4 ways, for example, as 53993104 + 627953481 = 7348^2 + 25059^2 .

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

It is not a de Polignac number, because 681946585 - 2¹ = 681946583 is a prime.

It is a super-2 number, since 2×681946585² = 930102289586324450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681946583) 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, 4011366 + ... + 4011535.

It is an arithmetic number, because the mean of its divisors is an integer number (108309177).

Almost surely, 2^681946585 is an apocalyptic number.

It is an amenable number.

681946585 is a deficient number, since it is larger than the sum of its proper divisors (184526831).

681946585 is a wasteful number, since it uses less digits than its factorization.

681946585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8022923.

The product of its digits is 2073600, while the sum is 52.

The square root of 681946585 is about 26114.1070113454. The cubic root of 681946585 is about 880.2042333307.

The spelling of 681946585 in words is "six hundred eighty-one million, nine hundred forty-six thousand, five hundred eighty-five".