11001997 has 4 divisors (see below), whose sum is σ = 11014236. Its totient is φ = 10989760.

The previous prime is 11001983. The next prime is 11002001. The reversal of 11001997 is 79910011.

11001997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10666756 + 335241 = 3266^2 + 579^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001997 - 2¹¹ = 10999949 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 (11001967) 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, 4654 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (2753559).

Almost surely, 2^11001997 is an apocalyptic number.

It is an amenable number.

11001997 is a deficient number, since it is larger than the sum of its proper divisors (12239).

11001997 is an equidigital number, since it uses as much as digits as its factorization.

11001997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12238.

The product of its (nonzero) digits is 567, while the sum is 28.

The square root of 11001997 is about 3316.9258357702. The cubic root of 11001997 is about 222.4114666918.

The spelling of 11001997 in words is "eleven million, one thousand, nine hundred ninety-seven".