11013991 has 4 divisors (see below), whose sum is σ = 11023000. Its totient is φ = 11004984.

The previous prime is 11013979. The next prime is 11014001. The reversal of 11013991 is 19931011.

11013991 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11013991 - 2¹⁷ = 10882919 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 (11013911) 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, 2316 + ... + 5233.

It is an arithmetic number, because the mean of its divisors is an integer number (2755750).

Almost surely, 2^11013991 is an apocalyptic number.

11013991 is a deficient number, since it is larger than the sum of its proper divisors (9009).

11013991 is an equidigital number, since it uses as much as digits as its factorization.

11013991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9008.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 11013991 is about 3318.7333427077. The cubic root of 11013991 is about 222.4922591256.

The spelling of 11013991 in words is "eleven million, thirteen thousand, nine hundred ninety-one".