11531199 has 4 divisors (see below), whose sum is σ = 15374936. Its totient is φ = 7687464.

The previous prime is 11531197. The next prime is 11531203. The reversal of 11531199 is 99113511.

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

It is not a de Polignac number, because 11531199 - 2¹ = 11531197 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 (11531197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1921864 + ... + 1921869.

It is an arithmetic number, because the mean of its divisors is an integer number (3843734).

Almost surely, 2^11531199 is an apocalyptic number.

11531199 is a deficient number, since it is larger than the sum of its proper divisors (3843737).

11531199 is an equidigital number, since it uses as much as digits as its factorization.

11531199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3843736.

The product of its digits is 1215, while the sum is 30.

The square root of 11531199 is about 3395.7619174495. The cubic root of 11531199 is about 225.9218083851.

The spelling of 11531199 in words is "eleven million, five hundred thirty-one thousand, one hundred ninety-nine".