45165221 has 4 divisors (see below), whose sum is σ = 45187212. Its totient is φ = 45143232.

The previous prime is 45165217. The next prime is 45165229. The reversal of 45165221 is 12256154.

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 9333025 + 35832196 = 3055^2 + 5986^2 .

It is a cyclic number.

It is not a de Polignac number, because 45165221 - 2² = 45165217 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 (45165229) 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, 7556 + ... + 12141.

It is an arithmetic number, because the mean of its divisors is an integer number (11296803).

Almost surely, 2^45165221 is an apocalyptic number.

It is an amenable number.

45165221 is a deficient number, since it is larger than the sum of its proper divisors (21991).

45165221 is a wasteful number, since it uses less digits than its factorization.

45165221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21990.

The product of its digits is 2400, while the sum is 26.

The square root of 45165221 is about 6720.5074957179. The cubic root of 45165221 is about 356.1241124509.

The spelling of 45165221 in words is "forty-five million, one hundred sixty-five thousand, two hundred twenty-one".