10991867 has 2 divisors, whose sum is σ = 10991868. Its totient is φ = 10991866.

The previous prime is 10991863. The next prime is 10991873. The reversal of 10991867 is 76819901.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10991867 - 2² = 10991863 is a prime.

It is a super-2 number, since 2×10991867² = 241642280291378, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10991863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5495933 + 5495934.

It is an arithmetic number, because the mean of its divisors is an integer number (5495934).

Almost surely, 2^10991867 is an apocalyptic number.

10991867 is a deficient number, since it is larger than the sum of its proper divisors (1).

10991867 is an equidigital number, since it uses as much as digits as its factorization.

10991867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 10991867 is about 3315.3984677562. The cubic root of 10991867 is about 222.3431845427.

The spelling of 10991867 in words is "ten million, nine hundred ninety-one thousand, eight hundred sixty-seven".