445220257 has 4 divisors (see below), whose sum is σ = 446034736. Its totient is φ = 444405780.

The previous prime is 445220231. The next prime is 445220263. The reversal of 445220257 is 752022544.

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 not a de Polignac number, because 445220257 - 2¹⁵ = 445187489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445220207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406419 + ... + 407512.

It is an arithmetic number, because the mean of its divisors is an integer number (111508684).

Almost surely, 2^445220257 is an apocalyptic number.

It is an amenable number.

445220257 is a deficient number, since it is larger than the sum of its proper divisors (814479).

445220257 is an equidigital number, since it uses as much as digits as its factorization.

445220257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814478.

The product of its (nonzero) digits is 22400, while the sum is 31.

The square root of 445220257 is about 21100.2430554721. The cubic root of 445220257 is about 763.5866120902.

The spelling of 445220257 in words is "four hundred forty-five million, two hundred twenty thousand, two hundred fifty-seven".