681241172 has 6 divisors (see below), whose sum is σ = 1192172058. Its totient is φ = 340620584.

The previous prime is 681241147. The next prime is 681241177. The reversal of 681241172 is 271142186.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 609398596 + 71842576 = 24686^2 + 8476^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681241177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85155143 + ... + 85155150.

It is an arithmetic number, because the mean of its divisors is an integer number (198695343).

Almost surely, 2^681241172 is an apocalyptic number.

It is an amenable number.

681241172 is a deficient number, since it is larger than the sum of its proper divisors (510930886).

681241172 is a wasteful number, since it uses less digits than its factorization.

681241172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170310297 (or 170310295 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 681241172 is about 26100.5971579196. The cubic root of 681241172 is about 879.9006309974.

It can be divided in two parts, 68124 and 1172, that added together give a palindrome (69296).

The spelling of 681241172 in words is "six hundred eighty-one million, two hundred forty-one thousand, one hundred seventy-two".