11669991 has 8 divisors (see below), whose sum is σ = 15611904. Its totient is φ = 7754040.

The previous prime is 11669969. The next prime is 11670011. The reversal of 11669991 is 19996611.

11669991 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 11669991 - 2⁶ = 11669927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11669921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5415 + ... + 7256.

It is an arithmetic number, because the mean of its divisors is an integer number (1951488).

Almost surely, 2^11669991 is an apocalyptic number.

11669991 is a deficient number, since it is larger than the sum of its proper divisors (3941913).

11669991 is a wasteful number, since it uses less digits than its factorization.

11669991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12981.

The product of its digits is 26244, while the sum is 42.

The square root of 11669991 is about 3416.1368532306. The cubic root of 11669991 is about 226.8246104577.

It can be divided in two parts, 116 and 69991, that added together give a palindrome (70107).

The spelling of 11669991 in words is "eleven million, six hundred sixty-nine thousand, nine hundred ninety-one".