65243861 has 2 divisors, whose sum is σ = 65243862. Its totient is φ = 65243860.

The previous prime is 65243821. The next prime is 65243887. The reversal of 65243861 is 16834256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62504836 + 2739025 = 7906^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 65243861 - 2¹⁸ = 64981717 is a prime.

It is a super-2 number, since 2×65243861² = 8513522796374642, 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 (65243821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32621930 + 32621931.

It is an arithmetic number, because the mean of its divisors is an integer number (32621931).

Almost surely, 2^65243861 is an apocalyptic number.

It is an amenable number.

65243861 is a deficient number, since it is larger than the sum of its proper divisors (1).

65243861 is an equidigital number, since it uses as much as digits as its factorization.

65243861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 65243861 is about 8077.3672072031. The cubic root of 65243861 is about 402.5747679475.

The spelling of 65243861 in words is "sixty-five million, two hundred forty-three thousand, eight hundred sixty-one".