45138989 has 4 divisors (see below), whose sum is σ = 51587424. Its totient is φ = 38690556.

The previous prime is 45138979. The next prime is 45139013. The reversal of 45138989 is 98983154.

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.

It is a cyclic number.

It is not a de Polignac number, because 45138989 - 2⁸ = 45138733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45138959) 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, 3224207 + ... + 3224220.

It is an arithmetic number, because the mean of its divisors is an integer number (12896856).

Almost surely, 2^45138989 is an apocalyptic number.

It is an amenable number.

45138989 is a deficient number, since it is larger than the sum of its proper divisors (6448435).

45138989 is an equidigital number, since it uses as much as digits as its factorization.

45138989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6448434.

The product of its digits is 311040, while the sum is 47.

The square root of 45138989 is about 6718.5555739311. Note that the first 4 decimals coincide. The cubic root of 45138989 is about 356.0551533663.

The spelling of 45138989 in words is "forty-five million, one hundred thirty-eight thousand, nine hundred eighty-nine".