681396365 has 32 divisors (see below), whose sum is σ = 913006080. Its totient is φ = 484982784.

The previous prime is 681396349. The next prime is 681396377. The reversal of 681396365 is 563693186.

681396365 = 3156² + 3157² + ... + 3222².

It is not a de Polignac number, because 681396365 - 2⁴ = 681396349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 203021 + ... + 206349.

It is an arithmetic number, because the mean of its divisors is an integer number (28531440).

Almost surely, 2^681396365 is an apocalyptic number.

681396365 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

681396365 is a deficient number, since it is larger than the sum of its proper divisors (231609715).

681396365 is a wasteful number, since it uses less digits than its factorization.

681396365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3461.

The product of its digits is 699840, while the sum is 47.

The square root of 681396365 is about 26103.5699665774. The cubic root of 681396365 is about 879.9674424077.

The spelling of 681396365 in words is "six hundred eighty-one million, three hundred ninety-six thousand, three hundred sixty-five".