11555997 has 8 divisors (see below), whose sum is σ = 15423744. Its totient is φ = 7696128.

The previous prime is 11555987. The next prime is 11556001. The reversal of 11555997 is 79955511.

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

It is not a de Polignac number, because 11555997 - 2¹⁴ = 11539613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4413 + ... + 6525.

It is an arithmetic number, because the mean of its divisors is an integer number (1927968).

Almost surely, 2^11555997 is an apocalyptic number.

It is an amenable number.

11555997 is a deficient number, since it is larger than the sum of its proper divisors (3867747).

11555997 is a wasteful number, since it uses less digits than its factorization.

11555997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939.

The product of its digits is 70875, while the sum is 42.

The square root of 11555997 is about 3399.4112725588. The cubic root of 11555997 is about 226.0836417376.

The spelling of 11555997 in words is "eleven million, five hundred fifty-five thousand, nine hundred ninety-seven".