45020191 has 4 divisors (see below), whose sum is σ = 45208800. Its totient is φ = 44831584.

The previous prime is 45020189. The next prime is 45020203. The reversal of 45020191 is 19102054.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19102054 = 2 ⋅9551027.

It is a cyclic number.

It is not a de Polignac number, because 45020191 - 2¹ = 45020189 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 (45020491) 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, 93946 + ... + 94423.

It is an arithmetic number, because the mean of its divisors is an integer number (11302200).

Almost surely, 2^45020191 is an apocalyptic number.

45020191 is a deficient number, since it is larger than the sum of its proper divisors (188609).

45020191 is a wasteful number, since it uses less digits than its factorization.

45020191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188608.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 45020191 is about 6709.7087120083. The cubic root of 45020191 is about 355.7425204447.

The spelling of 45020191 in words is "forty-five million, twenty thousand, one hundred ninety-one".