13621001 has 2 divisors, whose sum is σ = 13621002. Its totient is φ = 13621000.

The previous prime is 13620949. The next prime is 13621009. The reversal of 13621001 is 10012631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11868025 + 1752976 = 3445^2 + 1324^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13621001 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13621009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6810500 + 6810501.

It is an arithmetic number, because the mean of its divisors is an integer number (6810501).

Almost surely, 2^13621001 is an apocalyptic number.

It is an amenable number.

13621001 is a deficient number, since it is larger than the sum of its proper divisors (1).

13621001 is an equidigital number, since it uses as much as digits as its factorization.

13621001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 13621001 is about 3690.6640323931. The cubic root of 13621001 is about 238.8194396119.

Adding to 13621001 its reverse (10012631), we get a palindrome (23633632).

The spelling of 13621001 in words is "thirteen million, six hundred twenty-one thousand, one".