45851221 has 12 divisors (see below), whose sum is σ = 50179332. Its totient is φ = 41872896.

The previous prime is 45851207. The next prime is 45851293. The reversal of 45851221 is 12215854.

It can be written as a sum of positive squares in 6 ways, for example, as 3783025 + 42068196 = 1945^2 + 6486^2 .

It is not a de Polignac number, because 45851221 - 2⁵ = 45851189 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 45851221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45852221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14995 + ... + 17791.

It is an arithmetic number, because the mean of its divisors is an integer number (4181611).

Almost surely, 2^45851221 is an apocalyptic number.

It is an amenable number.

45851221 is a deficient number, since it is larger than the sum of its proper divisors (4328111).

45851221 is a wasteful number, since it uses less digits than its factorization.

45851221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920 (or 2907 counting only the distinct ones).

The product of its digits is 3200, while the sum is 28.

The square root of 45851221 is about 6771.3529667268. The cubic root of 45851221 is about 357.9180783808.

The spelling of 45851221 in words is "forty-five million, eight hundred fifty-one thousand, two hundred twenty-one".