681507202 has 4 divisors (see below), whose sum is σ = 1022260806. Its totient is φ = 340753600.

The previous prime is 681507161. The next prime is 681507209. The reversal of 681507202 is 202705186.

681507202 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 548543241 + 132963961 = 23421^2 + 11531^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (681507209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170376799 + ... + 170376802.

Almost surely, 2^681507202 is an apocalyptic number.

681507202 is a deficient number, since it is larger than the sum of its proper divisors (340753604).

681507202 is a wasteful number, since it uses less digits than its factorization.

681507202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340753603.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 681507202 is about 26105.6929040391. The cubic root of 681507202 is about 880.0151521151.

The spelling of 681507202 in words is "six hundred eighty-one million, five hundred seven thousand, two hundred two".