11666531 has 6 divisors (see below), whose sum is σ = 11788140. Its totient is φ = 11546156.

The previous prime is 11666521. The next prime is 11666533. The reversal of 11666531 is 13566611.

It is not a de Polignac number, because 11666531 - 2¹⁴ = 11650147 is a prime.

It is a super-2 number, since 2×11666531² = 272215891147922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11666494 and 11666503.

It is not an unprimeable number, because it can be changed into a prime (11666533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10940 + ... + 11958.

It is an arithmetic number, because the mean of its divisors is an integer number (1964690).

Almost surely, 2^11666531 is an apocalyptic number.

11666531 is a deficient number, since it is larger than the sum of its proper divisors (121609).

11666531 is an equidigital number, since it uses as much as digits as its factorization.

11666531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1126 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 11666531 is about 3415.6303956956. The cubic root of 11666531 is about 226.8021913965.

The spelling of 11666531 in words is "eleven million, six hundred sixty-six thousand, five hundred thirty-one".