681246719 has 4 divisors (see below), whose sum is σ = 692414760. Its totient is φ = 670078680.

The previous prime is 681246697. The next prime is 681246751. The reversal of 681246719 is 917642186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 681246719 - 2¹⁶ = 681181183 is a prime.

It is a super-4 number, since 4×681246719⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 681246719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681246779) 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, 5583929 + ... + 5584050.

It is an arithmetic number, because the mean of its divisors is an integer number (173103690).

Almost surely, 2^681246719 is an apocalyptic number.

681246719 is a deficient number, since it is larger than the sum of its proper divisors (11168041).

681246719 is a wasteful number, since it uses less digits than its factorization.

681246719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11168040.

The product of its digits is 145152, while the sum is 44.

The square root of 681246719 is about 26100.7034196399. The cubic root of 681246719 is about 879.9030191852.

The spelling of 681246719 in words is "six hundred eighty-one million, two hundred forty-six thousand, seven hundred nineteen".