45905621 has 4 divisors (see below), whose sum is σ = 45919200. Its totient is φ = 45892044.

The previous prime is 45905603. The next prime is 45905647. The reversal of 45905621 is 12650954.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 45905621 - 2¹⁰ = 45904597 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 (45905681) 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, 2750 + ... + 9968.

It is an arithmetic number, because the mean of its divisors is an integer number (11479800).

Almost surely, 2^45905621 is an apocalyptic number.

It is an amenable number.

45905621 is a deficient number, since it is larger than the sum of its proper divisors (13579).

45905621 is an equidigital number, since it uses as much as digits as its factorization.

45905621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13578.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 45905621 is about 6775.3686984547. The cubic root of 45905621 is about 358.0595726004.

The spelling of 45905621 in words is "forty-five million, nine hundred five thousand, six hundred twenty-one".