13229981 has 2 divisors, whose sum is σ = 13229982. Its totient is φ = 13229980.

The previous prime is 13229941. The next prime is 13229999. The reversal of 13229981 is 18992231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13205956 + 24025 = 3634^2 + 155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13229981 is a prime.

It is a super-2 number, since 2×13229981² = 350064794520722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13229941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6614990 + 6614991.

It is an arithmetic number, because the mean of its divisors is an integer number (6614991).

Almost surely, 2^13229981 is an apocalyptic number.

It is an amenable number.

13229981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13229981 is an equidigital number, since it uses as much as digits as its factorization.

13229981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 13229981 is about 3637.3040840711. The cubic root of 13229981 is about 236.5119416724.

The spelling of 13229981 in words is "thirteen million, two hundred twenty-nine thousand, nine hundred eighty-one".