76563281 has 2 divisors, whose sum is σ = 76563282. Its totient is φ = 76563280.

The previous prime is 76563269. The next prime is 76563287. The reversal of 76563281 is 18236567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43890625 + 32672656 = 6625^2 + 5716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76563281 is a prime.

It is a super-2 number, since 2×76563281² = 11723871994969922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76563287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38281640 + 38281641.

It is an arithmetic number, because the mean of its divisors is an integer number (38281641).

Almost surely, 2^76563281 is an apocalyptic number.

It is an amenable number.

76563281 is a deficient number, since it is larger than the sum of its proper divisors (1).

76563281 is an equidigital number, since it uses as much as digits as its factorization.

76563281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 76563281 is about 8750.0446284576. The cubic root of 76563281 is about 424.6262568955.

It can be divided in two parts, 765 and 63281, that added together give a palindrome (64046).

The spelling of 76563281 in words is "seventy-six million, five hundred sixty-three thousand, two hundred eighty-one".