5644533991 has 2 divisors, whose sum is σ = 5644533992. Its totient is φ = 5644533990.

The previous prime is 5644533989. The next prime is 5644534039. The reversal of 5644533991 is 1993354465.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5644533991 - 2¹ = 5644533989 is a prime.

Together with 5644533989, 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 (5644533901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2822266995 + 2822266996.

It is an arithmetic number, because the mean of its divisors is an integer number (2822266996).

Almost surely, 2^5644533991 is an apocalyptic number.

5644533991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5644533991 is an equidigital number, since it uses as much as digits as its factorization.

5644533991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1749600, while the sum is 49.

The square root of 5644533991 is about 75130.1137427596. The cubic root of 5644533991 is about 1780.5029499720.

The spelling of 5644533991 in words is "five billion, six hundred forty-four million, five hundred thirty-three thousand, nine hundred ninety-one".