13621261 has 2 divisors, whose sum is σ = 13621262. Its totient is φ = 13621260.

The previous prime is 13621253. The next prime is 13621303. The reversal of 13621261 is 16212631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9418761 + 4202500 = 3069^2 + 2050^2 .

It is a cyclic number.

It is not a de Polignac number, because 13621261 - 2³ = 13621253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13621241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6810630 + 6810631.

It is an arithmetic number, because the mean of its divisors is an integer number (6810631).

Almost surely, 2^13621261 is an apocalyptic number.

It is an amenable number.

13621261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13621261 is an equidigital number, since it uses as much as digits as its factorization.

13621261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 13621261 is about 3690.6992562386. The cubic root of 13621261 is about 238.8209591444.

Adding to 13621261 its reverse (16212631), we get a palindrome (29833892).

The spelling of 13621261 in words is "thirteen million, six hundred twenty-one thousand, two hundred sixty-one".