11564531 has 16 divisors (see below), whose sum is σ = 13029120. Its totient is φ = 10175520.

The previous prime is 11564513. The next prime is 11564543. The reversal of 11564531 is 13546511.

It is a cyclic number.

It is not a de Polignac number, because 11564531 - 2¹⁰ = 11563507 is a prime.

It is a super-2 number, since 2×11564531² = 267476754499922, which contains 22 as substring.

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 11564531.

It is not an unprimeable number, because it can be changed into a prime (11561531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66761 + ... + 66933.

It is an arithmetic number, because the mean of its divisors is an integer number (814320).

Almost surely, 2^11564531 is an apocalyptic number.

11564531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11564531 is a deficient number, since it is larger than the sum of its proper divisors (1464589).

11564531 is a wasteful number, since it uses less digits than its factorization.

11564531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346.

The product of its digits is 1800, while the sum is 26.

The square root of 11564531 is about 3400.6662582500. Note that the first 3 decimals coincide. The cubic root of 11564531 is about 226.1392816230.

It can be divided in two parts, 11564 and 531, that multiplied together give a square (6140484 = 2478²).

The spelling of 11564531 in words is "eleven million, five hundred sixty-four thousand, five hundred thirty-one".