65221397 has 2 divisors, whose sum is σ = 65221398. Its totient is φ = 65221396.

The previous prime is 65221393. The next prime is 65221423. The reversal of 65221397 is 79312256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55741156 + 9480241 = 7466^2 + 3079^2 .

It is a cyclic number.

It is not a de Polignac number, because 65221397 - 2² = 65221393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65221393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32610698 + 32610699.

It is an arithmetic number, because the mean of its divisors is an integer number (32610699).

Almost surely, 2^65221397 is an apocalyptic number.

It is an amenable number.

65221397 is a deficient number, since it is larger than the sum of its proper divisors (1).

65221397 is an equidigital number, since it uses as much as digits as its factorization.

65221397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 35.

The square root of 65221397 is about 8075.9765353795. The cubic root of 65221397 is about 402.5285593716.

The spelling of 65221397 in words is "sixty-five million, two hundred twenty-one thousand, three hundred ninety-seven".