45020581 has 4 divisors (see below), whose sum is σ = 45057600. Its totient is φ = 44983564.

The previous prime is 45020567. The next prime is 45020609. The reversal of 45020581 is 18502054.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18502054 = 2 ⋅9251027.

It is a cyclic number.

It is not a de Polignac number, because 45020581 - 2⁹ = 45020069 is a prime.

It is a super-2 number, since 2×45020581² = 4053705427155122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45020551) 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, 16621 + ... + 19138.

It is an arithmetic number, because the mean of its divisors is an integer number (11264400).

Almost surely, 2^45020581 is an apocalyptic number.

It is an amenable number.

45020581 is a deficient number, since it is larger than the sum of its proper divisors (37019).

45020581 is a wasteful number, since it uses less digits than its factorization.

45020581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37018.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 45020581 is about 6709.7377743098. The cubic root of 45020581 is about 355.7435476814.

The spelling of 45020581 in words is "forty-five million, twenty thousand, five hundred eighty-one".