10863991 has 4 divisors (see below), whose sum is σ = 11435800. Its totient is φ = 10292184.

The previous prime is 10863973. The next prime is 10864093. The reversal of 10863991 is 19936801.

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 10863991 - 2¹¹ = 10861943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10863991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10863691) 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, 285876 + ... + 285913.

It is an arithmetic number, because the mean of its divisors is an integer number (2858950).

Almost surely, 2^10863991 is an apocalyptic number.

10863991 is a deficient number, since it is larger than the sum of its proper divisors (571809).

10863991 is an equidigital number, since it uses as much as digits as its factorization.

10863991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571808.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 10863991 is about 3296.0568866450. The cubic root of 10863991 is about 221.4775950719.

The spelling of 10863991 in words is "ten million, eight hundred sixty-three thousand, nine hundred ninety-one".