765216281 has 2 divisors, whose sum is σ = 765216282. Its totient is φ = 765216280.

The previous prime is 765216247. The next prime is 765216289. The reversal of 765216281 is 182612567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 751637056 + 13579225 = 27416^2 + 3685^2 .

It is a cyclic number.

It is not a de Polignac number, because 765216281 - 2⁶ = 765216217 is a prime.

It is a super-2 number, since 2×765216281² = 1171111913414941922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (765216289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382608140 + 382608141.

It is an arithmetic number, because the mean of its divisors is an integer number (382608141).

Almost surely, 2^765216281 is an apocalyptic number.

It is an amenable number.

765216281 is a deficient number, since it is larger than the sum of its proper divisors (1).

765216281 is an equidigital number, since it uses as much as digits as its factorization.

765216281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 765216281 is about 27662.5429235998. The cubic root of 765216281 is about 914.6636091123.

The spelling of 765216281 in words is "seven hundred sixty-five million, two hundred sixteen thousand, two hundred eighty-one".