13573981 has 2 divisors, whose sum is σ = 13573982. Its totient is φ = 13573980.

The previous prime is 13573951. The next prime is 13573991. The reversal of 13573981 is 18937531.

It is a happy number.

13573981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10458756 + 3115225 = 3234^2 + 1765^2 .

It is a cyclic number.

It is not a de Polignac number, because 13573981 - 2⁵ = 13573949 is a prime.

It is a super-2 number, since 2×13573981² = 368505920376722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13573981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13573921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6786990 + 6786991.

It is an arithmetic number, because the mean of its divisors is an integer number (6786991).

Almost surely, 2^13573981 is an apocalyptic number.

It is an amenable number.

13573981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13573981 is an equidigital number, since it uses as much as digits as its factorization.

13573981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 13573981 is about 3684.2883980492. The cubic root of 13573981 is about 238.5443194466.

The spelling of 13573981 in words is "thirteen million, five hundred seventy-three thousand, nine hundred eighty-one".