12633981 has 16 divisors (see below), whose sum is σ = 17297280. Its totient is φ = 8199360.

The previous prime is 12633979. The next prime is 12633997. The reversal of 12633981 is 18933621.

It is not a de Polignac number, because 12633981 - 2¹ = 12633979 is a prime.

It is a super-2 number, since 2×12633981² = 319234951816722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12633911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28560 + ... + 28998.

It is an arithmetic number, because the mean of its divisors is an integer number (1081080).

Almost surely, 2^12633981 is an apocalyptic number.

It is an amenable number.

12633981 is a deficient number, since it is larger than the sum of its proper divisors (4663299).

12633981 is a wasteful number, since it uses less digits than its factorization.

12633981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676.

The product of its digits is 7776, while the sum is 33.

The square root of 12633981 is about 3554.4311781212. The cubic root of 12633981 is about 232.9056762995.

The spelling of 12633981 in words is "twelve million, six hundred thirty-three thousand, nine hundred eighty-one".