45012591 has 24 divisors (see below), whose sum is σ = 72618000. Its totient is φ = 27698112.

The previous prime is 45012581. The next prime is 45012599. The reversal of 45012591 is 19521054.

45012591 is a `hidden beast` number, since 450 + 125 + 91 = 666.

It is not a de Polignac number, because 45012591 - 2¹⁷ = 44881519 is a prime.

It is a super-2 number, since 2×45012591² = 4052266697066562, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45012599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3966 + ... + 10283.

It is an arithmetic number, because the mean of its divisors is an integer number (3025750).

Almost surely, 2^45012591 is an apocalyptic number.

45012591 is a deficient number, since it is larger than the sum of its proper divisors (27605409).

45012591 is a wasteful number, since it uses less digits than its factorization.

45012591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14277 (or 14265 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 45012591 is about 6709.1423445922. The cubic root of 45012591 is about 355.7225013137.

It can be divided in two parts, 450 and 12591, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 45012591 in words is "forty-five million, twelve thousand, five hundred ninety-one".