13212981 has 6 divisors (see below), whose sum is σ = 19085430. Its totient is φ = 8808648.

The previous prime is 13212967. The next prime is 13213001. The reversal of 13212981 is 18921231.

It can be written as a sum of positive squares in only one way, i.e., 6937956 + 6275025 = 2634^2 + 2505^2 .

It is not a de Polignac number, because 13212981 - 2⁶ = 13212917 is a prime.

It is a super-2 number, since 2×13212981² = 349165733812722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13212931) 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 5 ways as a sum of consecutive naturals, for example, 734046 + ... + 734063.

It is an arithmetic number, because the mean of its divisors is an integer number (3180905).

Almost surely, 2^13212981 is an apocalyptic number.

It is an amenable number.

13212981 is a deficient number, since it is larger than the sum of its proper divisors (5872449).

13212981 is a wasteful number, since it uses less digits than its factorization.

13212981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468115 (or 1468112 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 13212981 is about 3634.9664372591. The cubic root of 13212981 is about 236.4105954350.

The spelling of 13212981 in words is "thirteen million, two hundred twelve thousand, nine hundred eighty-one".