681450865 has 32 divisors (see below), whose sum is σ = 918656640. Its totient is φ = 482227200.

The previous prime is 681450859. The next prime is 681450871. The reversal of 681450865 is 568054186.

681450865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (681450859) and next prime (681450871).

It is not a de Polignac number, because 681450865 - 2²¹ = 679353713 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209955 + ... + 213175.

It is an arithmetic number, because the mean of its divisors is an integer number (28708020).

Almost surely, 2^681450865 is an apocalyptic number.

It is an amenable number.

681450865 is a deficient number, since it is larger than the sum of its proper divisors (237205775).

681450865 is a wasteful number, since it uses less digits than its factorization.

681450865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3393.

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 681450865 is about 26104.6138642195. The cubic root of 681450865 is about 879.9909025402.

The spelling of 681450865 in words is "six hundred eighty-one million, four hundred fifty thousand, eight hundred sixty-five".