51622213 has 2 divisors, whose sum is σ = 51622214. Its totient is φ = 51622212.

The previous prime is 51622199. The next prime is 51622273. The reversal of 51622213 is 31222615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46812964 + 4809249 = 6842^2 + 2193^2 .

It is a cyclic number.

It is not a de Polignac number, because 51622213 - 2²⁵ = 18067781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51622273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25811106 + 25811107.

It is an arithmetic number, because the mean of its divisors is an integer number (25811107).

Almost surely, 2^51622213 is an apocalyptic number.

It is an amenable number.

51622213 is a deficient number, since it is larger than the sum of its proper divisors (1).

51622213 is an equidigital number, since it uses as much as digits as its factorization.

51622213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 51622213 is about 7184.8599847179. The cubic root of 51622213 is about 372.3450112690.

Adding to 51622213 its reverse (31222615), we get a palindrome (82844828).

The spelling of 51622213 in words is "fifty-one million, six hundred twenty-two thousand, two hundred thirteen".