445533521 has 2 divisors, whose sum is σ = 445533522. Its totient is φ = 445533520.

The previous prime is 445533497. The next prime is 445533547. The reversal of 445533521 is 125335544.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 425184400 + 20349121 = 20620^2 + 4511^2 .

It is a cyclic number.

It is not a de Polignac number, because 445533521 - 2¹⁰ = 445532497 is a prime.

It is not a weakly prime, because it can be changed into another prime (445533551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222766760 + 222766761.

It is an arithmetic number, because the mean of its divisors is an integer number (222766761).

Almost surely, 2^445533521 is an apocalyptic number.

It is an amenable number.

445533521 is a deficient number, since it is larger than the sum of its proper divisors (1).

445533521 is an equidigital number, since it uses as much as digits as its factorization.

445533521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36000, while the sum is 32.

The square root of 445533521 is about 21107.6649821812. The cubic root of 445533521 is about 763.7656606337.

The spelling of 445533521 in words is "four hundred forty-five million, five hundred thirty-three thousand, five hundred twenty-one".