45123142321 has 4 divisors (see below), whose sum is σ = 45139277812. Its totient is φ = 45107006832.

The previous prime is 45123142271. The next prime is 45123142331. The reversal of 45123142321 is 12324132154.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21048206400 + 24074935921 = 145080^2 + 155161^2 .

It is a cyclic number.

It is not a de Polignac number, because 45123142321 - 2¹⁷ = 45123011249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 45123142321.

It is not an unprimeable number, because it can be changed into a prime (45123142331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8063550 + ... + 8069143.

It is an arithmetic number, because the mean of its divisors is an integer number (11284819453).

Almost surely, 2^45123142321 is an apocalyptic number.

It is an amenable number.

45123142321 is a deficient number, since it is larger than the sum of its proper divisors (16135491).

45123142321 is a wasteful number, since it uses less digits than its factorization.

45123142321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16135490.

The product of its digits is 5760, while the sum is 28.

Adding to 45123142321 its reverse (12324132154), we get a palindrome (57447274475).

The spelling of 45123142321 in words is "forty-five billion, one hundred twenty-three million, one hundred forty-two thousand, three hundred twenty-one".