13211951 has 2 divisors, whose sum is σ = 13211952. Its totient is φ = 13211950.

The previous prime is 13211917. The next prime is 13211953. The reversal of 13211951 is 15911231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13211951 is a prime.

Together with 13211953, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13211953) 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, 6605975 + 6605976.

It is an arithmetic number, because the mean of its divisors is an integer number (6605976).

Almost surely, 2^13211951 is an apocalyptic number.

13211951 is a deficient number, since it is larger than the sum of its proper divisors (1).

13211951 is an equidigital number, since it uses as much as digits as its factorization.

13211951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 23.

The square root of 13211951 is about 3634.8247550604. The cubic root of 13211951 is about 236.4044522530.

The spelling of 13211951 in words is "thirteen million, two hundred eleven thousand, nine hundred fifty-one".