45123891 has 4 divisors (see below), whose sum is σ = 60165192. Its totient is φ = 30082592.

The previous prime is 45123889. The next prime is 45123893. The reversal of 45123891 is 19832154.

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

It is an interprime number because it is at equal distance from previous prime (45123889) and next prime (45123893).

It is a cyclic number.

It is not a de Polignac number, because 45123891 - 2¹ = 45123889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45123893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7520646 + ... + 7520651.

It is an arithmetic number, because the mean of its divisors is an integer number (15041298).

Almost surely, 2^45123891 is an apocalyptic number.

45123891 is a deficient number, since it is larger than the sum of its proper divisors (15041301).

45123891 is a wasteful number, since it uses less digits than its factorization.

45123891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15041300.

The product of its digits is 8640, while the sum is 33.

The square root of 45123891 is about 6717.4318753524. The cubic root of 45123891 is about 356.0154513977.

It can be divided in two parts, 451 and 23891, that added together give a palindrome (24342).

The spelling of 45123891 in words is "forty-five million, one hundred twenty-three thousand, eight hundred ninety-one".