681150981 has 8 divisors (see below), whose sum is σ = 1037944384. Its totient is φ = 389229120.

The previous prime is 681150971. The next prime is 681151021. The reversal of 681150981 is 189051186.

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

It is not a de Polignac number, because 681150981 - 2¹⁰ = 681149957 is a prime.

It is a super-2 number, since 2×681150981² = 927933317834524722, 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 (681150901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16217860 + ... + 16217901.

It is an arithmetic number, because the mean of its divisors is an integer number (129743048).

Almost surely, 2^681150981 is an apocalyptic number.

It is an amenable number.

681150981 is a deficient number, since it is larger than the sum of its proper divisors (356793403).

681150981 is a wasteful number, since it uses less digits than its factorization.

681150981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32435771.

The product of its (nonzero) digits is 17280, while the sum is 39.

The square root of 681150981 is about 26098.8693433260. The cubic root of 681150981 is about 879.8617986310.

The spelling of 681150981 in words is "six hundred eighty-one million, one hundred fifty thousand, nine hundred eighty-one".