11611997 has 4 divisors (see below), whose sum is σ = 11618880. Its totient is φ = 11605116.

The previous prime is 11611981. The next prime is 11612047. The reversal of 11611997 is 79911611.

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, 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 11611997 - 2⁴ = 11611981 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 (11611927) 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, 1004 + ... + 4922.

It is an arithmetic number, because the mean of its divisors is an integer number (2904720).

Almost surely, 2^11611997 is an apocalyptic number.

It is an amenable number.

11611997 is a deficient number, since it is larger than the sum of its proper divisors (6883).

11611997 is an equidigital number, since it uses as much as digits as its factorization.

11611997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6882.

The product of its digits is 3402, while the sum is 35.

The square root of 11611997 is about 3407.6380382899. The cubic root of 11611997 is about 226.4482514932.

The spelling of 11611997 in words is "eleven million, six hundred eleven thousand, nine hundred ninety-seven".