681675349 has 4 divisors (see below), whose sum is σ = 681805900. Its totient is φ = 681544800.

The previous prime is 681675287. The next prime is 681675377. The reversal of 681675349 is 943576186.

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 353703249 + 327972100 = 18807^2 + 18110^2 .

It is a cyclic number.

It is not a de Polignac number, because 681675349 - 2⁷ = 681675221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681675649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57102 + ... + 67999.

It is an arithmetic number, because the mean of its divisors is an integer number (170451475).

Almost surely, 2^681675349 is an apocalyptic number.

It is an amenable number.

681675349 is a deficient number, since it is larger than the sum of its proper divisors (130551).

681675349 is a wasteful number, since it uses less digits than its factorization.

681675349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130550.

The product of its digits is 1088640, while the sum is 49.

The square root of 681675349 is about 26108.9132098600. The cubic root of 681675349 is about 880.0875209957.

The spelling of 681675349 in words is "six hundred eighty-one million, six hundred seventy-five thousand, three hundred forty-nine".