65089781 has 2 divisors, whose sum is σ = 65089782. Its totient is φ = 65089780.

The previous prime is 65089769. The next prime is 65089789. The reversal of 65089781 is 18798056.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41809156 + 23280625 = 6466^2 + 4825^2 .

It is a cyclic number.

It is not a de Polignac number, because 65089781 - 2²² = 60895477 is a prime.

It is a super-2 number, since 2×65089781² = 8473359181255922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65089789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32544890 + 32544891.

It is an arithmetic number, because the mean of its divisors is an integer number (32544891).

Almost surely, 2^65089781 is an apocalyptic number.

It is an amenable number.

65089781 is a deficient number, since it is larger than the sum of its proper divisors (1).

65089781 is an equidigital number, since it uses as much as digits as its factorization.

65089781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 65089781 is about 8067.8238081902. The cubic root of 65089781 is about 402.2576110916.

The spelling of 65089781 in words is "sixty-five million, eighty-nine thousand, seven hundred eighty-one".