45538681 has 4 divisors (see below), whose sum is σ = 46115200. Its totient is φ = 44962164.

The previous prime is 45538673. The next prime is 45538693. The reversal of 45538681 is 18683554.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18683554 = 2 ⋅9341777.

It is a cyclic number.

It is not a de Polignac number, because 45538681 - 2³ = 45538673 is a prime.

It is a super-2 number, since 2×45538681² = 4147542934439522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45538621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288141 + ... + 288298.

It is an arithmetic number, because the mean of its divisors is an integer number (11528800).

Almost surely, 2^45538681 is an apocalyptic number.

It is an amenable number.

45538681 is a deficient number, since it is larger than the sum of its proper divisors (576519).

45538681 is an equidigital number, since it uses as much as digits as its factorization.

45538681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576518.

The product of its digits is 115200, while the sum is 40.

The square root of 45538681 is about 6748.2353989765. The cubic root of 45538681 is about 357.1029866577.

The spelling of 45538681 in words is "forty-five million, five hundred thirty-eight thousand, six hundred eighty-one".