681723001 has 16 divisors (see below), whose sum is σ = 736931520. Its totient is φ = 628334080.

The previous prime is 681722969. The next prime is 681723041. The reversal of 681723001 is 100327186.

It is a cyclic number.

It is not a de Polignac number, because 681723001 - 2⁵ = 681722969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681723041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159786 + ... + 163996.

It is an arithmetic number, because the mean of its divisors is an integer number (46058220).

Almost surely, 2^681723001 is an apocalyptic number.

It is an amenable number.

681723001 is a deficient number, since it is larger than the sum of its proper divisors (55208519).

681723001 is a wasteful number, since it uses less digits than its factorization.

681723001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 681723001 is about 26109.8257558338. The cubic root of 681723001 is about 880.1080278021.

The spelling of 681723001 in words is "six hundred eighty-one million, seven hundred twenty-three thousand, one".