51911213 has 2 divisors, whose sum is σ = 51911214. Its totient is φ = 51911212.

The previous prime is 51911129. The next prime is 51911219. The reversal of 51911213 is 31211915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37908649 + 14002564 = 6157^2 + 3742^2 .

It is a cyclic number.

It is not a de Polignac number, because 51911213 - 2¹² = 51907117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51911219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25955606 + 25955607.

It is an arithmetic number, because the mean of its divisors is an integer number (25955607).

Almost surely, 2^51911213 is an apocalyptic number.

It is an amenable number.

51911213 is a deficient number, since it is larger than the sum of its proper divisors (1).

51911213 is an equidigital number, since it uses as much as digits as its factorization.

51911213 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 51911213 is about 7204.9436500225. The cubic root of 51911213 is about 373.0385597447.

The spelling of 51911213 in words is "fifty-one million, nine hundred eleven thousand, two hundred thirteen".