681507213 has 8 divisors (see below), whose sum is σ = 910729248. Its totient is φ = 453311664.

The previous prime is 681507209. The next prime is 681507217. The reversal of 681507213 is 312705186.

It is an interprime number because it is at equal distance from previous prime (681507209) and next prime (681507217).

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

It is not a de Polignac number, because 681507213 - 2² = 681507209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681507217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255070 + ... + 257727.

It is an arithmetic number, because the mean of its divisors is an integer number (113841156).

Almost surely, 2^681507213 is an apocalyptic number.

It is an amenable number.

681507213 is a deficient number, since it is larger than the sum of its proper divisors (229222035).

681507213 is a wasteful number, since it uses less digits than its factorization.

681507213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513243.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 681507213 is about 26105.6931147212. The cubic root of 681507213 is about 880.0151568498.

The spelling of 681507213 in words is "six hundred eighty-one million, five hundred seven thousand, two hundred thirteen".