65840531 has 2 divisors, whose sum is σ = 65840532. Its totient is φ = 65840530.

The previous prime is 65840521. The next prime is 65840539. The reversal of 65840531 is 13504856.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65840531 is a prime.

It is a super-2 number, since 2×65840531² = 8669951044723922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65840539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32920265 + 32920266.

It is an arithmetic number, because the mean of its divisors is an integer number (32920266).

Almost surely, 2^65840531 is an apocalyptic number.

65840531 is a deficient number, since it is larger than the sum of its proper divisors (1).

65840531 is an equidigital number, since it uses as much as digits as its factorization.

65840531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 65840531 is about 8114.2178304504. The cubic root of 65840531 is about 403.7982585046.

The spelling of 65840531 in words is "sixty-five million, eight hundred forty thousand, five hundred thirty-one".