10691881 has 2 divisors, whose sum is σ = 10691882. Its totient is φ = 10691880.

The previous prime is 10691873. The next prime is 10691887. The reversal of 10691881 is 18819601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7750656 + 2941225 = 2784^2 + 1715^2 .

It is an emirp because it is prime and its reverse (18819601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10691881 - 2³ = 10691873 is a prime.

It is a super-3 number, since 3×10691881³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (10691887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5345940 + 5345941.

It is an arithmetic number, because the mean of its divisors is an integer number (5345941).

Almost surely, 2^10691881 is an apocalyptic number.

It is an amenable number.

10691881 is a deficient number, since it is larger than the sum of its proper divisors (1).

10691881 is an equidigital number, since it uses as much as digits as its factorization.

10691881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 10691881 is about 3269.8441858902. The cubic root of 10691881 is about 220.3017965492.

The spelling of 10691881 in words is "ten million, six hundred ninety-one thousand, eight hundred eighty-one".