12633281 has 4 divisors (see below), whose sum is σ = 12676692. Its totient is φ = 12589872.

The previous prime is 12633253. The next prime is 12633311. The reversal of 12633281 is 18233621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18233621 = 7 ⋅2604803.

It can be written as a sum of positive squares in 2 ways, for example, as 9247681 + 3385600 = 3041^2 + 1840^2 .

It is a cyclic number.

It is not a de Polignac number, because 12633281 - 2⁶ = 12633217 is a prime.

It is a super-2 number, since 2×12633281² = 319199577649922, 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 12633281.

It is not an unprimeable number, because it can be changed into a prime (12633211) 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, 21266 + ... + 21851.

It is an arithmetic number, because the mean of its divisors is an integer number (3169173).

Almost surely, 2^12633281 is an apocalyptic number.

It is an amenable number.

12633281 is a deficient number, since it is larger than the sum of its proper divisors (43411).

12633281 is an equidigital number, since it uses as much as digits as its factorization.

12633281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43410.

The product of its digits is 1728, while the sum is 26.

The square root of 12633281 is about 3554.3327081184. The cubic root of 12633281 is about 232.9013747526.

The spelling of 12633281 in words is "twelve million, six hundred thirty-three thousand, two hundred eighty-one".