445696221 has 4 divisors (see below), whose sum is σ = 594261632. Its totient is φ = 297130812.

The previous prime is 445696219. The next prime is 445696249. The reversal of 445696221 is 122696544.

It is a happy number.

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 not a de Polignac number, because 445696221 - 2¹ = 445696219 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 445696221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445696211) 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, 74282701 + ... + 74282706.

It is an arithmetic number, because the mean of its divisors is an integer number (148565408).

Almost surely, 2^445696221 is an apocalyptic number.

It is an amenable number.

445696221 is a deficient number, since it is larger than the sum of its proper divisors (148565411).

445696221 is a wasteful number, since it uses less digits than its factorization.

445696221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148565410.

The product of its digits is 103680, while the sum is 39.

The square root of 445696221 is about 21111.5186805687. The cubic root of 445696221 is about 763.8586200063.

The spelling of 445696221 in words is "four hundred forty-five million, six hundred ninety-six thousand, two hundred twenty-one".