45123921 has 6 divisors (see below), whose sum is σ = 65179010. Its totient is φ = 30082608.

The previous prime is 45123893. The next prime is 45123961. The reversal of 45123921 is 12932154.

It can be written as a sum of positive squares in only one way, i.e., 37638225 + 7485696 = 6135^2 + 2736^2 .

It is not a de Polignac number, because 45123921 - 2⁵ = 45123889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45123961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2506876 + ... + 2506893.

Almost surely, 2^45123921 is an apocalyptic number.

It is an amenable number.

45123921 is a deficient number, since it is larger than the sum of its proper divisors (20055089).

45123921 is a wasteful number, since it uses less digits than its factorization.

45123921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5013775 (or 5013772 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 45123921 is about 6717.4341083482. The cubic root of 45123921 is about 356.0155302950.

The spelling of 45123921 in words is "forty-five million, one hundred twenty-three thousand, nine hundred twenty-one".