11531391 has 8 divisors (see below), whose sum is σ = 15408000. Its totient is φ = 7671192.

The previous prime is 11531371. The next prime is 11531407. The reversal of 11531391 is 19313511.

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

It is not a de Polignac number, because 11531391 - 2¹⁰ = 11530367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11531371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2355 + ... + 5348.

It is an arithmetic number, because the mean of its divisors is an integer number (1926000).

Almost surely, 2^11531391 is an apocalyptic number.

11531391 is a deficient number, since it is larger than the sum of its proper divisors (3876609).

11531391 is an equidigital number, since it uses as much as digits as its factorization.

11531391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8205.

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

The square root of 11531391 is about 3395.7901878650. The cubic root of 11531391 is about 225.9230622804.

The spelling of 11531391 in words is "eleven million, five hundred thirty-one thousand, three hundred ninety-one".