13163621 has 2 divisors, whose sum is σ = 13163622. Its totient is φ = 13163620.

The previous prime is 13163597. The next prime is 13163639. The reversal of 13163621 is 12636131.

It is a happy number.

13163621 is digitally balanced in base 2, 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., 6604900 + 6558721 = 2570^2 + 2561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13163621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13163641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6581810 + 6581811.

It is an arithmetic number, because the mean of its divisors is an integer number (6581811).

Almost surely, 2^13163621 is an apocalyptic number.

It is an amenable number.

13163621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13163621 is an equidigital number, since it uses as much as digits as its factorization.

13163621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 23.

The square root of 13163621 is about 3628.1704755979. The cubic root of 13163621 is about 236.1158401431.

Adding to 13163621 its reverse (12636131), we get a palindrome (25799752).

The spelling of 13163621 in words is "thirteen million, one hundred sixty-three thousand, six hundred twenty-one".