45420209 has 4 divisors (see below), whose sum is σ = 48092004. Its totient is φ = 42748416.

The previous prime is 45420187. The next prime is 45420211. The reversal of 45420209 is 90202454.

45420209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90202454 = 2 ⋅45101227.

It can be written as a sum of positive squares in 2 ways, for example, as 31192225 + 14227984 = 5585^2 + 3772^2 .

It is a cyclic number.

It is not a de Polignac number, because 45420209 - 2²⁴ = 28642993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (45420229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1335872 + ... + 1335905.

It is an arithmetic number, because the mean of its divisors is an integer number (12023001).

Almost surely, 2^45420209 is an apocalyptic number.

It is an amenable number.

45420209 is a deficient number, since it is larger than the sum of its proper divisors (2671795).

45420209 is a wasteful number, since it uses less digits than its factorization.

45420209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671794.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 45420209 is about 6739.4516839280. The cubic root of 45420209 is about 356.7930417555.

The spelling of 45420209 in words is "forty-five million, four hundred twenty thousand, two hundred nine".