65971261 has 2 divisors, whose sum is σ = 65971262. Its totient is φ = 65971260.

The previous prime is 65971253. The next prime is 65971267. The reversal of 65971261 is 16217956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54479161 + 11492100 = 7381^2 + 3390^2 .

It is a cyclic number.

It is not a de Polignac number, because 65971261 - 2³ = 65971253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65971261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65971267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32985630 + 32985631.

It is an arithmetic number, because the mean of its divisors is an integer number (32985631).

Almost surely, 2^65971261 is an apocalyptic number.

It is an amenable number.

65971261 is a deficient number, since it is larger than the sum of its proper divisors (1).

65971261 is an equidigital number, since it uses as much as digits as its factorization.

65971261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 65971261 is about 8122.2694488671. The cubic root of 65971261 is about 404.0653363761.

The spelling of 65971261 in words is "sixty-five million, nine hundred seventy-one thousand, two hundred sixty-one".