45685621 has 4 divisors (see below), whose sum is σ = 46264000. Its totient is φ = 45107244.

The previous prime is 45685597. The next prime is 45685669. The reversal of 45685621 is 12658654.

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: 12658654 = 2 ⋅6329327.

It is a cyclic number.

It is not a de Polignac number, because 45685621 - 2¹⁵ = 45652853 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 (45685421) 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, 289071 + ... + 289228.

It is an arithmetic number, because the mean of its divisors is an integer number (11566000).

Almost surely, 2^45685621 is an apocalyptic number.

It is an amenable number.

45685621 is a deficient number, since it is larger than the sum of its proper divisors (578379).

45685621 is an equidigital number, since it uses as much as digits as its factorization.

45685621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578378.

The product of its digits is 57600, while the sum is 37.

The square root of 45685621 is about 6759.1139212178. The cubic root of 45685621 is about 357.4866632350.

The spelling of 45685621 in words is "forty-five million, six hundred eighty-five thousand, six hundred twenty-one".