44813981 has 4 divisors (see below), whose sum is σ = 45573600. Its totient is φ = 44054364.

The previous prime is 44813953. The next prime is 44813999. The reversal of 44813981 is 18931844.

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 44813981 - 2⁶ = 44813917 is a prime.

It is a super-2 number, since 2×44813981² = 4016585786136722, 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 (44813911) 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, 379721 + ... + 379838.

It is an arithmetic number, because the mean of its divisors is an integer number (11393400).

Almost surely, 2^44813981 is an apocalyptic number.

It is an amenable number.

44813981 is a deficient number, since it is larger than the sum of its proper divisors (759619).

44813981 is an equidigital number, since it uses as much as digits as its factorization.

44813981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759618.

The product of its digits is 27648, while the sum is 38.

The square root of 44813981 is about 6694.3245365011. The cubic root of 44813981 is about 355.1985426456.

The spelling of 44813981 in words is "forty-four million, eight hundred thirteen thousand, nine hundred eighty-one".