45591021 has 36 divisors (see below), whose sum is σ = 77799072. Its totient is φ = 25646544.

The previous prime is 45591019. The next prime is 45591023. The reversal of 45591021 is 12019554.

45591021 is a `hidden beast` number, since 4 + 559 + 102 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (45591019) and next prime (45591023).

It is not a de Polignac number, because 45591021 - 2¹ = 45591019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45591023) 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 35 ways as a sum of consecutive naturals, for example, 28776 + ... + 30318.

Almost surely, 2^45591021 is an apocalyptic number.

It is an amenable number.

45591021 is a deficient number, since it is larger than the sum of its proper divisors (32208051).

45591021 is a wasteful number, since it uses less digits than its factorization.

45591021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630 (or 1620 counting only the distinct ones).

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

The square root of 45591021 is about 6752.1123361508. The cubic root of 45591021 is about 357.2397466876.

The spelling of 45591021 in words is "forty-five million, five hundred ninety-one thousand, twenty-one".