681012445 has 4 divisors (see below), whose sum is σ = 817214940. Its totient is φ = 544809952.

The previous prime is 681012443. The next prime is 681012461. The reversal of 681012445 is 544210186.

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

It can be written as a sum of positive squares in 2 ways, for example, as 176650681 + 504361764 = 13291^2 + 22458^2 .

It is a cyclic number.

It is not a de Polignac number, because 681012445 - 2¹ = 681012443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681012443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68101240 + ... + 68101249.

It is an arithmetic number, because the mean of its divisors is an integer number (204303735).

Almost surely, 2^681012445 is an apocalyptic number.

It is an amenable number.

681012445 is a deficient number, since it is larger than the sum of its proper divisors (136202495).

681012445 is a wasteful number, since it uses less digits than its factorization.

681012445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136202494.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 681012445 is about 26096.2151470285. The cubic root of 681012445 is about 879.8021443096.

The spelling of 681012445 in words is "six hundred eighty-one million, twelve thousand, four hundred forty-five".