445136561 has 2 divisors, whose sum is σ = 445136562. Its totient is φ = 445136560.

The previous prime is 445136539. The next prime is 445136563. The reversal of 445136561 is 165631544.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 436016161 + 9120400 = 20881^2 + 3020^2 .

It is a cyclic number.

It is not a de Polignac number, because 445136561 - 2²⁶ = 378027697 is a prime.

Together with 445136563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (445136563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222568280 + 222568281.

It is an arithmetic number, because the mean of its divisors is an integer number (222568281).

Almost surely, 2^445136561 is an apocalyptic number.

It is an amenable number.

445136561 is a deficient number, since it is larger than the sum of its proper divisors (1).

445136561 is an equidigital number, since it uses as much as digits as its factorization.

445136561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 445136561 is about 21098.2596675650. The cubic root of 445136561 is about 763.5387607558.

The spelling of 445136561 in words is "four hundred forty-five million, one hundred thirty-six thousand, five hundred sixty-one".