65217869 has 2 divisors, whose sum is σ = 65217870. Its totient is φ = 65217868.

The previous prime is 65217847. The next prime is 65217877. The reversal of 65217869 is 96871256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57304900 + 7912969 = 7570^2 + 2813^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65217869 is a prime.

It is a super-2 number, since 2×65217869² = 8506740873802322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65217469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32608934 + 32608935.

It is an arithmetic number, because the mean of its divisors is an integer number (32608935).

Almost surely, 2^65217869 is an apocalyptic number.

It is an amenable number.

65217869 is a deficient number, since it is larger than the sum of its proper divisors (1).

65217869 is an equidigital number, since it uses as much as digits as its factorization.

65217869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 65217869 is about 8075.7581068281. The cubic root of 65217869 is about 402.5213012916.

The spelling of 65217869 in words is "sixty-five million, two hundred seventeen thousand, eight hundred sixty-nine".