11531913 has 4 divisors (see below), whose sum is σ = 15375888. Its totient is φ = 7687940.

The previous prime is 11531909. The next prime is 11531921. The reversal of 11531913 is 31913511.

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.

It is a cyclic number.

It is not a de Polignac number, because 11531913 - 2² = 11531909 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11531903) 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, 1921983 + ... + 1921988.

It is an arithmetic number, because the mean of its divisors is an integer number (3843972).

Almost surely, 2^11531913 is an apocalyptic number.

It is an amenable number.

11531913 is a deficient number, since it is larger than the sum of its proper divisors (3843975).

11531913 is an equidigital number, since it uses as much as digits as its factorization.

11531913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3843974.

The product of its digits is 405, while the sum is 24.

The square root of 11531913 is about 3395.8670468674. The cubic root of 11531913 is about 225.9264712377.

The spelling of 11531913 in words is "eleven million, five hundred thirty-one thousand, nine hundred thirteen".