445455581 has 2 divisors, whose sum is σ = 445455582. Its totient is φ = 445455580.

The previous prime is 445455553. The next prime is 445455583. The reversal of 445455581 is 185554544.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 439531225 + 5924356 = 20965^2 + 2434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445455581 is a prime.

It is a super-2 number, since 2×445455581² = 396861349288095122, which contains 22 as substring.

Together with 445455583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (445455583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222727790 + 222727791.

It is an arithmetic number, because the mean of its divisors is an integer number (222727791).

Almost surely, 2^445455581 is an apocalyptic number.

It is an amenable number.

445455581 is a deficient number, since it is larger than the sum of its proper divisors (1).

445455581 is an equidigital number, since it uses as much as digits as its factorization.

445455581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320000, while the sum is 41.

The square root of 445455581 is about 21105.8186526844. The cubic root of 445455581 is about 763.7211212487.

The spelling of 445455581 in words is "four hundred forty-five million, four hundred fifty-five thousand, five hundred eighty-one".