745806221 has 8 divisors (see below), whose sum is σ = 787437600. Its totient is φ = 704412720.

The previous prime is 745806203. The next prime is 745806247. The reversal of 745806221 is 122608547.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 745806221 - 2¹⁸ = 745544077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745806121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53006 + ... + 65583.

It is an arithmetic number, because the mean of its divisors is an integer number (98429700).

Almost surely, 2^745806221 is an apocalyptic number.

It is an amenable number.

745806221 is a deficient number, since it is larger than the sum of its proper divisors (41631379).

745806221 is a wasteful number, since it uses less digits than its factorization.

745806221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118939.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 745806221 is about 27309.4529604677. The cubic root of 745806221 is about 906.8636629657.

The spelling of 745806221 in words is "seven hundred forty-five million, eight hundred six thousand, two hundred twenty-one".