11531771 has 4 divisors (see below), whose sum is σ = 11670792. Its totient is φ = 11392752.

The previous prime is 11531759. The next prime is 11531791. The reversal of 11531771 is 17713511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17713511 = 59 ⋅300229.

It is a cyclic number.

It is not a de Polignac number, because 11531771 - 2²² = 7337467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11531771.

It is not an unprimeable number, because it can be changed into a prime (11531731) 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, 69386 + ... + 69551.

It is an arithmetic number, because the mean of its divisors is an integer number (2917698).

Almost surely, 2^11531771 is an apocalyptic number.

11531771 is a deficient number, since it is larger than the sum of its proper divisors (139021).

11531771 is an equidigital number, since it uses as much as digits as its factorization.

11531771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139020.

The product of its digits is 735, while the sum is 26.

The square root of 11531771 is about 3395.8461390352. The cubic root of 11531771 is about 225.9255439070.

The spelling of 11531771 in words is "eleven million, five hundred thirty-one thousand, seven hundred seventy-one".