775408481 has 2 divisors, whose sum is σ = 775408482. Its totient is φ = 775408480.

The previous prime is 775408457. The next prime is 775408483. The reversal of 775408481 is 184804577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404653456 + 370755025 = 20116^2 + 19255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-775408481 is a prime.

It is a super-2 number, since 2×775408481² = 1202516624813454722, which contains 22 as substring.

Together with 775408483, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_39945437 and since 775408481 and 39945437 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (775408483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387704240 + 387704241.

It is an arithmetic number, because the mean of its divisors is an integer number (387704241).

Almost surely, 2^775408481 is an apocalyptic number.

It is an amenable number.

775408481 is a deficient number, since it is larger than the sum of its proper divisors (1).

775408481 is an equidigital number, since it uses as much as digits as its factorization.

775408481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 250880, while the sum is 44.

The square root of 775408481 is about 27846.1573830214. The cubic root of 775408481 is about 918.7066265732.

The spelling of 775408481 in words is "seven hundred seventy-five million, four hundred eight thousand, four hundred eighty-one".