10993991 has 4 divisors (see below), whose sum is σ = 11005800. Its totient is φ = 10982184.

The previous prime is 10993973. The next prime is 10993993. The reversal of 10993991 is 19939901.

10993991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10993991 - 2²² = 6799687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10993993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4376 + ... + 6413.

It is an arithmetic number, because the mean of its divisors is an integer number (2751450).

Almost surely, 2^10993991 is an apocalyptic number.

10993991 is a deficient number, since it is larger than the sum of its proper divisors (11809).

10993991 is a wasteful number, since it uses less digits than its factorization.

10993991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11808.

The product of its (nonzero) digits is 19683, while the sum is 41.

The square root of 10993991 is about 3315.7187757709. The cubic root of 10993991 is about 222.3575050250.

The spelling of 10993991 in words is "ten million, nine hundred ninety-three thousand, nine hundred ninety-one".