65371721 has 2 divisors, whose sum is σ = 65371722. Its totient is φ = 65371720.

The previous prime is 65371703. The next prime is 65371741. The reversal of 65371721 is 12717356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51681721 + 13690000 = 7189^2 + 3700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65371721 is a prime.

It is equal to p_3861149 and since 65371721 and 3861149 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (65371741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32685860 + 32685861.

It is an arithmetic number, because the mean of its divisors is an integer number (32685861).

Almost surely, 2^65371721 is an apocalyptic number.

It is an amenable number.

65371721 is a deficient number, since it is larger than the sum of its proper divisors (1).

65371721 is an equidigital number, since it uses as much as digits as its factorization.

65371721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 32.

The square root of 65371721 is about 8085.2780409829. The cubic root of 65371721 is about 402.8375749056.

The spelling of 65371721 in words is "sixty-five million, three hundred seventy-one thousand, seven hundred twenty-one".