44609981 has 4 divisors (see below), whose sum is σ = 48041532. Its totient is φ = 41178432.

The previous prime is 44609969. The next prime is 44609993. The reversal of 44609981 is 18990644.

Added to its reverse (18990644) it gives a square (63600625 = 7975²).

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (44609969) and next prime (44609993).

It can be written as a sum of positive squares in 2 ways, for example, as 10621081 + 33988900 = 3259^2 + 5830^2 .

It is a cyclic number.

It is not a de Polignac number, because 44609981 - 2²² = 40415677 is a prime.

It is a super-2 number, since 2×44609981² = 3980100809640722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44609911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1715756 + ... + 1715781.

It is an arithmetic number, because the mean of its divisors is an integer number (12010383).

Almost surely, 2^44609981 is an apocalyptic number.

It is an amenable number.

44609981 is a deficient number, since it is larger than the sum of its proper divisors (3431551).

44609981 is a wasteful number, since it uses less digits than its factorization.

44609981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3431550.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 44609981 is about 6679.0703694451. The cubic root of 44609981 is about 354.6587502983.

Adding to 44609981 its reverse (18990644), we get a square (63600625 = 7975²).

It can be divided in two parts, 4460 and 9981, that added together give a palindrome (14441).

The spelling of 44609981 in words is "forty-four million, six hundred nine thousand, nine hundred eighty-one".