681168933 has 10 divisors (see below), whose sum is σ = 1017548774. Its totient is φ = 454112568.

The previous prime is 681168919. The next prime is 681168941. The reversal of 681168933 is 339861186.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 463842369 + 217326564 = 21537^2 + 14742^2 .

It is not a de Polignac number, because 681168933 - 2⁹ = 681168421 is a prime.

It is a super-2 number, since 2×681168933² = 927982230568716978, 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 (681160933) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4204666 + ... + 4204827.

Almost surely, 2^681168933 is an apocalyptic number.

It is an amenable number.

681168933 is a deficient number, since it is larger than the sum of its proper divisors (336379841).

681168933 is an equidigital number, since it uses as much as digits as its factorization.

681168933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8409505 (or 8409496 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 681168933 is about 26099.2132640047. The cubic root of 681168933 is about 879.8695282635.

The spelling of 681168933 in words is "six hundred eighty-one million, one hundred sixty-eight thousand, nine hundred thirty-three".