45809981 has 8 divisors (see below), whose sum is σ = 53092224. Its totient is φ = 38712240.

The previous prime is 45809957. The next prime is 45810001. The reversal of 45809981 is 18990854.

45809981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-45809981 is a prime.

It is a super-2 number, since 2×45809981² = 4197108718440722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45809081) 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 7 ways as a sum of consecutive naturals, for example, 45590 + ... + 46583.

It is an arithmetic number, because the mean of its divisors is an integer number (6636528).

Almost surely, 2^45809981 is an apocalyptic number.

It is an amenable number.

45809981 is a deficient number, since it is larger than the sum of its proper divisors (7282243).

45809981 is an equidigital number, since it uses as much as digits as its factorization.

45809981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92251.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 45809981 is about 6768.3071000066. The cubic root of 45809981 is about 357.8107386793.

The spelling of 45809981 in words is "forty-five million, eight hundred nine thousand, nine hundred eighty-one".