445451521 has 4 divisors (see below), whose sum is σ = 445925844. Its totient is φ = 444977200.

The previous prime is 445451507. The next prime is 445451549. The reversal of 445451521 is 125154544.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 258855921 + 186595600 = 16089^2 + 13660^2 .

It is a cyclic number.

It is not a de Polignac number, because 445451521 - 2⁹ = 445451009 is a prime.

It is a super-2 number, since 2×445451521² = 396854115122426882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445451551) 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 in 3 ways as a sum of consecutive naturals, for example, 235750 + ... + 237631.

It is an arithmetic number, because the mean of its divisors is an integer number (111481461).

Almost surely, 2^445451521 is an apocalyptic number.

It is an amenable number.

445451521 is a deficient number, since it is larger than the sum of its proper divisors (474323).

445451521 is an equidigital number, since it uses as much as digits as its factorization.

445451521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474322.

The product of its digits is 16000, while the sum is 31.

The square root of 445451521 is about 21105.7224704581. The cubic root of 445451521 is about 763.7188009895.

The spelling of 445451521 in words is "four hundred forty-five million, four hundred fifty-one thousand, five hundred twenty-one".