12990281 has 4 divisors (see below), whose sum is σ = 13674000. Its totient is φ = 12306564.

The previous prime is 12990269. The next prime is 12990311. The reversal of 12990281 is 18209921.

It is a happy number.

12990281 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12990281 - 2⁶ = 12990217 is a prime.

It is a super-2 number, since 2×12990281² = 337494800917922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12990221) 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, 341831 + ... + 341868.

It is an arithmetic number, because the mean of its divisors is an integer number (3418500).

Almost surely, 2^12990281 is an apocalyptic number.

It is an amenable number.

12990281 is a deficient number, since it is larger than the sum of its proper divisors (683719).

12990281 is an equidigital number, since it uses as much as digits as its factorization.

12990281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683718.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12990281 is about 3604.2032406622. The cubic root of 12990281 is about 235.0748576972.

The spelling of 12990281 in words is "twelve million, nine hundred ninety thousand, two hundred eighty-one".