811668941 has 4 divisors (see below), whose sum is σ = 817044384. Its totient is φ = 806293500.

The previous prime is 811668911. The next prime is 811668953. The reversal of 811668941 is 149866118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 811668941 - 2¹⁸ = 811406797 is a prime.

It is a super-2 number, since 2×811668941² = 1317612939568122962, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 811668892 and 811668901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811668901) 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 3 ways as a sum of consecutive naturals, for example, 2687495 + ... + 2687796.

It is an arithmetic number, because the mean of its divisors is an integer number (204261096).

Almost surely, 2^811668941 is an apocalyptic number.

It is an amenable number.

811668941 is a deficient number, since it is larger than the sum of its proper divisors (5375443).

811668941 is a wasteful number, since it uses less digits than its factorization.

811668941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5375442.

The product of its digits is 82944, while the sum is 44.

The square root of 811668941 is about 28489.8041586810. The cubic root of 811668941 is about 932.8095332876.

The spelling of 811668941 in words is "eight hundred eleven million, six hundred sixty-eight thousand, nine hundred forty-one".