45643591 has 4 divisors (see below), whose sum is σ = 52164112. Its totient is φ = 39123072.

The previous prime is 45643573. The next prime is 45643649. The reversal of 45643591 is 19534654.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 45643591 - 2¹⁹ = 45119303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 45643591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45643531) 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, 3260250 + ... + 3260263.

It is an arithmetic number, because the mean of its divisors is an integer number (13041028).

Almost surely, 2^45643591 is an apocalyptic number.

45643591 is a deficient number, since it is larger than the sum of its proper divisors (6520521).

45643591 is an equidigital number, since it uses as much as digits as its factorization.

45643591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6520520.

The product of its digits is 64800, while the sum is 37.

The square root of 45643591 is about 6756.0040704547. The cubic root of 45643591 is about 357.3770023679.

The spelling of 45643591 in words is "forty-five million, six hundred forty-three thousand, five hundred ninety-one".