45102221 has 4 divisors (see below), whose sum is σ = 46657500. Its totient is φ = 43546944.

The previous prime is 45102217. The next prime is 45102229. The reversal of 45102221 is 12220154.

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 15888196 + 29214025 = 3986^2 + 5405^2 .

It is a cyclic number.

It is not a de Polignac number, because 45102221 - 2² = 45102217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 45102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45102229) 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, 777596 + ... + 777653.

It is an arithmetic number, because the mean of its divisors is an integer number (11664375).

Almost surely, 2^45102221 is an apocalyptic number.

It is an amenable number.

45102221 is a deficient number, since it is larger than the sum of its proper divisors (1555279).

45102221 is a wasteful number, since it uses less digits than its factorization.

45102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555278.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 45102221 is about 6715.8187140512. The cubic root of 45102221 is about 355.9584521011.

Adding to 45102221 its reverse (12220154), we get a palindrome (57322375).

The spelling of 45102221 in words is "forty-five million, one hundred two thousand, two hundred twenty-one".