681042181 has 8 divisors (see below), whose sum is σ = 683978400. Its totient is φ = 678113040.

The previous prime is 681042179. The next prime is 681042191. The reversal of 681042181 is 181240186.

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 681042181 - 2¹ = 681042179 is a prime.

It is a super-2 number, since 2×681042181² = 927636904602473522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681042101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275730 + ... + 278188.

It is an arithmetic number, because the mean of its divisors is an integer number (85497300).

Almost surely, 2^681042181 is an apocalyptic number.

It is an amenable number.

681042181 is a deficient number, since it is larger than the sum of its proper divisors (2936219).

681042181 is a wasteful number, since it uses less digits than its factorization.

681042181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3539.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 681042181 is about 26096.7848786014. The cubic root of 681042181 is about 879.8149494675.

The spelling of 681042181 in words is "six hundred eighty-one million, forty-two thousand, one hundred eighty-one".