12866531 has 4 divisors (see below), whose sum is σ = 12884592. Its totient is φ = 12848472.

The previous prime is 12866473. The next prime is 12866537. The reversal of 12866531 is 13566821.

It is a happy number.

12866531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13566821 = 491 ⋅27631.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12866531 is a prime.

It is a super-2 number, since 2×12866531² = 331095239947922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12866537) 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, 7916 + ... + 9401.

It is an arithmetic number, because the mean of its divisors is an integer number (3221148).

Almost surely, 2^12866531 is an apocalyptic number.

12866531 is a deficient number, since it is larger than the sum of its proper divisors (18061).

12866531 is an equidigital number, since it uses as much as digits as its factorization.

12866531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18060.

The product of its digits is 8640, while the sum is 32.

The square root of 12866531 is about 3586.9947030906. The cubic root of 12866531 is about 234.3260060197.

The spelling of 12866531 in words is "twelve million, eight hundred sixty-six thousand, five hundred thirty-one".