13225981 has 2 divisors, whose sum is σ = 13225982. Its totient is φ = 13225980.

The previous prime is 13225973. The next prime is 13225987. The reversal of 13225981 is 18952231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9821956 + 3404025 = 3134^2 + 1845^2 .

It is a cyclic number.

It is not a de Polignac number, because 13225981 - 2³ = 13225973 is a prime.

It is a super-2 number, since 2×13225981² = 349853146824722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13225987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6612990 + 6612991.

It is an arithmetic number, because the mean of its divisors is an integer number (6612991).

Almost surely, 2^13225981 is an apocalyptic number.

It is an amenable number.

13225981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13225981 is an equidigital number, since it uses as much as digits as its factorization.

13225981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 13225981 is about 3636.7541847092. The cubic root of 13225981 is about 236.4881033130.

The spelling of 13225981 in words is "thirteen million, two hundred twenty-five thousand, nine hundred eighty-one".