10991965 has 8 divisors (see below), whose sum is σ = 13217760. Its totient is φ = 8775312.

The previous prime is 10991951. The next prime is 10991983. The reversal of 10991965 is 56919901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10991965 - 2¹¹ = 10989917 is a prime.

It is a super-2 number, since 2×10991965² = 241646589122450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726 + ... + 4744.

It is an arithmetic number, because the mean of its divisors is an integer number (1652220).

Almost surely, 2^10991965 is an apocalyptic number.

It is an amenable number.

10991965 is a deficient number, since it is larger than the sum of its proper divisors (2225795).

10991965 is an equidigital number, since it uses as much as digits as its factorization.

10991965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4571.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 10991965 is about 3315.4132472438. The cubic root of 10991965 is about 222.3438453212.

The spelling of 10991965 in words is "ten million, nine hundred ninety-one thousand, nine hundred sixty-five".