45178221 has 32 divisors (see below), whose sum is σ = 68203008. Its totient is φ = 26360640.

The previous prime is 45178213. The next prime is 45178249. The reversal of 45178221 is 12287154.

It is not a de Polignac number, because 45178221 - 2³ = 45178213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45178121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198910 + ... + 199136.

It is an arithmetic number, because the mean of its divisors is an integer number (2131344).

Almost surely, 2^45178221 is an apocalyptic number.

It is an amenable number.

45178221 is a deficient number, since it is larger than the sum of its proper divisors (23024787).

45178221 is a wasteful number, since it uses less digits than its factorization.

45178221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441.

The product of its digits is 4480, while the sum is 30.

The square root of 45178221 is about 6721.4746149933. The cubic root of 45178221 is about 356.1582771558.

The spelling of 45178221 in words is "forty-five million, one hundred seventy-eight thousand, two hundred twenty-one".