45128081 has 4 divisors (see below), whose sum is σ = 47782692. Its totient is φ = 42473472.

The previous prime is 45128023. The next prime is 45128087. The reversal of 45128081 is 18082154.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18082154 = 2 ⋅9041077.

It can be written as a sum of positive squares in 2 ways, for example, as 29604481 + 15523600 = 5441^2 + 3940^2 .

It is a cyclic number.

It is not a de Polignac number, because 45128081 - 2¹⁰ = 45127057 is a prime.

It is a super-2 number, since 2×45128081² = 4073087389485122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45128087) 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, 1327280 + ... + 1327313.

It is an arithmetic number, because the mean of its divisors is an integer number (11945673).

Almost surely, 2^45128081 is an apocalyptic number.

It is an amenable number.

45128081 is a deficient number, since it is larger than the sum of its proper divisors (2654611).

45128081 is a wasteful number, since it uses less digits than its factorization.

45128081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654610.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 45128081 is about 6717.7437432519. The cubic root of 45128081 is about 356.0264703837.

The spelling of 45128081 in words is "forty-five million, one hundred twenty-eight thousand, eighty-one".