12900281 has 4 divisors (see below), whose sum is σ = 13214964. Its totient is φ = 12585600.

The previous prime is 12900227. The next prime is 12900289. The reversal of 12900281 is 18200921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1032256 + 11868025 = 1016^2 + 3445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12900281 is a prime.

It is a super-2 number, since 2×12900281² = 332834499757922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12900289) 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, 157280 + ... + 157361.

It is an arithmetic number, because the mean of its divisors is an integer number (3303741).

Almost surely, 2^12900281 is an apocalyptic number.

It is an amenable number.

12900281 is a deficient number, since it is larger than the sum of its proper divisors (314683).

12900281 is an equidigital number, since it uses as much as digits as its factorization.

12900281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314682.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 12900281 is about 3591.6961174353. The cubic root of 12900281 is about 234.5307127862.

The spelling of 12900281 in words is "twelve million, nine hundred thousand, two hundred eighty-one".