44481991 has 2 divisors, whose sum is σ = 44481992. Its totient is φ = 44481990.

The previous prime is 44481989. The next prime is 44482043. The reversal of 44481991 is 19918444.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 44481991 - 2¹ = 44481989 is a prime.

Together with 44481989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44481901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22240995 + 22240996.

It is an arithmetic number, because the mean of its divisors is an integer number (22240996).

Almost surely, 2^44481991 is an apocalyptic number.

44481991 is a deficient number, since it is larger than the sum of its proper divisors (1).

44481991 is an equidigital number, since it uses as much as digits as its factorization.

44481991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 44481991 is about 6669.4820638487. The cubic root of 44481991 is about 354.3192429076.

The spelling of 44481991 in words is "forty-four million, four hundred eighty-one thousand, nine hundred ninety-one".