45020251 has 4 divisors (see below), whose sum is σ = 45040072. Its totient is φ = 45000432.

The previous prime is 45020249. The next prime is 45020317. The reversal of 45020251 is 15202054.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 45020251 - 2¹ = 45020249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45020051) 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, 5985 + ... + 11218.

It is an arithmetic number, because the mean of its divisors is an integer number (11260018).

Almost surely, 2^45020251 is an apocalyptic number.

45020251 is a deficient number, since it is larger than the sum of its proper divisors (19821).

45020251 is a wasteful number, since it uses less digits than its factorization.

45020251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19820.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 45020251 is about 6709.7131831398. The cubic root of 45020251 is about 355.7426784815.

The spelling of 45020251 in words is "forty-five million, twenty thousand, two hundred fifty-one".