681525719 has 8 divisors (see below), whose sum is σ = 812751360. Its totient is φ = 558766296.

The previous prime is 681525703. The next prime is 681525721. The reversal of 681525719 is 917525186.

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

It is a cyclic number.

It is not a de Polignac number, because 681525719 - 2⁴ = 681525703 is a prime.

It is a super-2 number, since 2×681525719² = 928954611316933922, which contains 22 as substring.

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 681525719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681525769) 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, 2116379 + ... + 2116700.

It is an arithmetic number, because the mean of its divisors is an integer number (101593920).

Almost surely, 2^681525719 is an apocalyptic number.

681525719 is a deficient number, since it is larger than the sum of its proper divisors (131225641).

681525719 is a wasteful number, since it uses less digits than its factorization.

681525719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4233109.

The product of its digits is 151200, while the sum is 44.

The square root of 681525719 is about 26106.0475560741. The cubic root of 681525719 is about 880.0231222402.

The spelling of 681525719 in words is "six hundred eighty-one million, five hundred twenty-five thousand, seven hundred nineteen".