681181189 has 8 divisors (see below), whose sum is σ = 750640352. Its totient is φ = 614159280.

The previous prime is 681181183. The next prime is 681181219. The reversal of 681181189 is 981181186.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681181189 - 2³ = 681181181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

681181189 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681181181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 608727 + ... + 609844.

It is an arithmetic number, because the mean of its divisors is an integer number (93830044).

Almost surely, 2^681181189 is an apocalyptic number.

It is an amenable number.

681181189 is a deficient number, since it is larger than the sum of its proper divisors (69459163).

681181189 is a wasteful number, since it uses less digits than its factorization.

681181189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218627.

The product of its digits is 27648, while the sum is 43.

The square root of 681181189 is about 26099.4480592981. The cubic root of 681181189 is about 879.8748052786.

The spelling of 681181189 in words is "six hundred eighty-one million, one hundred eighty-one thousand, one hundred eighty-nine".