681549323 has 16 divisors (see below), whose sum is σ = 882981120. Its totient is φ = 510865056.

The previous prime is 681549301. The next prime is 681549367. The reversal of 681549323 is 323945186.

It is not a de Polignac number, because 681549323 - 2⁸ = 681549067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681549373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195365 + ... + 198822.

It is an arithmetic number, because the mean of its divisors is an integer number (55186320).

Almost surely, 2^681549323 is an apocalyptic number.

681549323 is a deficient number, since it is larger than the sum of its proper divisors (201431797).

681549323 is a wasteful number, since it uses less digits than its factorization.

681549323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394226.

The product of its digits is 155520, while the sum is 41.

The square root of 681549323 is about 26106.4996313179. The cubic root of 681549323 is about 880.0332817130.

It can be divided in two parts, 68154 and 9323, that added together give a palindrome (77477).

The spelling of 681549323 in words is "six hundred eighty-one million, five hundred forty-nine thousand, three hundred twenty-three".