445451021 has 4 divisors (see below), whose sum is σ = 446665152. Its totient is φ = 444236892.

The previous prime is 445451011. The next prime is 445451047. The reversal of 445451021 is 120154544.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445451021 is a prime.

It is a super-2 number, since 2×445451021² = 396853224219884882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445451011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606515 + ... + 607248.

It is an arithmetic number, because the mean of its divisors is an integer number (111666288).

Almost surely, 2^445451021 is an apocalyptic number.

It is an amenable number.

445451021 is a deficient number, since it is larger than the sum of its proper divisors (1214131).

445451021 is a wasteful number, since it uses less digits than its factorization.

445451021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214130.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 445451021 is about 21105.7106253260. The cubic root of 445451021 is about 763.7185152424.

The spelling of 445451021 in words is "four hundred forty-five million, four hundred fifty-one thousand, twenty-one".