445256081 has 2 divisors, whose sum is σ = 445256082. Its totient is φ = 445256080.

The previous prime is 445256041. The next prime is 445256083. The reversal of 445256081 is 180652544.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412090000 + 33166081 = 20300^2 + 5759^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445256081 is a prime.

It is a super-2 number, since 2×445256081² = 396505955334957122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 445256083, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is equal to p_23614793 and since 445256081 and 23614793 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 (445256083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222628040 + 222628041.

It is an arithmetic number, because the mean of its divisors is an integer number (222628041).

Almost surely, 2^445256081 is an apocalyptic number.

It is an amenable number.

445256081 is a deficient number, since it is larger than the sum of its proper divisors (1).

445256081 is an equidigital number, since it uses as much as digits as its factorization.

445256081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 445256081 is about 21101.0919385704. The cubic root of 445256081 is about 763.6070918360.

The spelling of 445256081 in words is "four hundred forty-five million, two hundred fifty-six thousand, eighty-one".