10991913 has 4 divisors (see below), whose sum is σ = 14655888. Its totient is φ = 7327940.

The previous prime is 10991909. The next prime is 10991917. The reversal of 10991913 is 31919901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (10991909) and next prime (10991917).

It is a cyclic number.

It is not a de Polignac number, because 10991913 - 2² = 10991909 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10991917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1831983 + ... + 1831988.

It is an arithmetic number, because the mean of its divisors is an integer number (3663972).

Almost surely, 2^10991913 is an apocalyptic number.

It is an amenable number.

10991913 is a deficient number, since it is larger than the sum of its proper divisors (3663975).

10991913 is an equidigital number, since it uses as much as digits as its factorization.

10991913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3663974.

The product of its (nonzero) digits is 2187, while the sum is 33.

The square root of 10991913 is about 3315.4054050749. The cubic root of 10991913 is about 222.3434947045.

The spelling of 10991913 in words is "ten million, nine hundred ninety-one thousand, nine hundred thirteen".