65851213 has 2 divisors, whose sum is σ = 65851214. Its totient is φ = 65851212.

The previous prime is 65851171. The next prime is 65851237. The reversal of 65851213 is 31215856.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51811204 + 14040009 = 7198^2 + 3747^2 .

It is a cyclic number.

It is not a de Polignac number, because 65851213 - 2¹⁷ = 65720141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65851243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32925606 + 32925607.

It is an arithmetic number, because the mean of its divisors is an integer number (32925607).

Almost surely, 2^65851213 is an apocalyptic number.

It is an amenable number.

65851213 is a deficient number, since it is larger than the sum of its proper divisors (1).

65851213 is an equidigital number, since it uses as much as digits as its factorization.

65851213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 31.

The square root of 65851213 is about 8114.8760310925. The cubic root of 65851213 is about 403.8200947995.

The spelling of 65851213 in words is "sixty-five million, eight hundred fifty-one thousand, two hundred thirteen".