65254781 has 2 divisors, whose sum is σ = 65254782. Its totient is φ = 65254780.

The previous prime is 65254733. The next prime is 65254799. The reversal of 65254781 is 18745256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52330756 + 12924025 = 7234^2 + 3595^2 .

It is a cyclic number.

It is not a de Polignac number, because 65254781 - 2²² = 61060477 is a prime.

It is a super-2 number, since 2×65254781² = 8516372886715922, which contains 22 as substring.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is equal to p_3854648 and since 65254781 and 3854648 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65250781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32627390 + 32627391.

It is an arithmetic number, because the mean of its divisors is an integer number (32627391).

Almost surely, 2^65254781 is an apocalyptic number.

It is an amenable number.

65254781 is a deficient number, since it is larger than the sum of its proper divisors (1).

65254781 is an equidigital number, since it uses as much as digits as its factorization.

65254781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 38.

The square root of 65254781 is about 8078.0431417516. The cubic root of 65254781 is about 402.5972266184.

The spelling of 65254781 in words is "sixty-five million, two hundred fifty-four thousand, seven hundred eighty-one".