681513026 has 8 divisors (see below), whose sum is σ = 1022413260. Its totient is φ = 340708608.

The previous prime is 681512999. The next prime is 681513031. The reversal of 681513026 is 620315186.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 680949025 + 564001 = 26095^2 + 751^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 681512983 and 681513001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2231 + ... + 36986.

Almost surely, 2^681513026 is an apocalyptic number.

681513026 is a deficient number, since it is larger than the sum of its proper divisors (340900234).

681513026 is a wasteful number, since it uses less digits than its factorization.

681513026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47908.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 681513026 is about 26105.8044503516. The cubic root of 681513026 is about 880.0176589087.

The spelling of 681513026 in words is "six hundred eighty-one million, five hundred thirteen thousand, twenty-six".