65221297 has 2 divisors, whose sum is σ = 65221298. Its totient is φ = 65221296.

The previous prime is 65221259. The next prime is 65221313. The reversal of 65221297 is 79212256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62583921 + 2637376 = 7911^2 + 1624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65221297 is a prime.

It is not a weakly prime, because it can be changed into another prime (65221207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32610648 + 32610649.

It is an arithmetic number, because the mean of its divisors is an integer number (32610649).

Almost surely, 2^65221297 is an apocalyptic number.

It is an amenable number.

65221297 is a deficient number, since it is larger than the sum of its proper divisors (1).

65221297 is an equidigital number, since it uses as much as digits as its factorization.

65221297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 65221297 is about 8075.9703441754. The cubic root of 65221297 is about 402.5283536473.

The spelling of 65221297 in words is "sixty-five million, two hundred twenty-one thousand, two hundred ninety-seven".