13219961 has 2 divisors, whose sum is σ = 13219962. Its totient is φ = 13219960.

The previous prime is 13219951. The next prime is 13219979. The reversal of 13219961 is 16991231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12924025 + 295936 = 3595^2 + 544^2 .

It is a cyclic number.

It is not a de Polignac number, because 13219961 - 2¹⁰ = 13218937 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13219901) 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, 6609980 + 6609981.

It is an arithmetic number, because the mean of its divisors is an integer number (6609981).

Almost surely, 2^13219961 is an apocalyptic number.

It is an amenable number.

13219961 is a deficient number, since it is larger than the sum of its proper divisors (1).

13219961 is an equidigital number, since it uses as much as digits as its factorization.

13219961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 32.

The square root of 13219961 is about 3635.9264293987. The cubic root of 13219961 is about 236.4522175203.

The spelling of 13219961 in words is "thirteen million, two hundred nineteen thousand, nine hundred sixty-one".