5991553 has 2 divisors, whose sum is σ = 5991554. Its totient is φ = 5991552.

The previous prime is 5991551. The next prime is 5991563. The reversal of 5991553 is 3551995.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5461569 + 529984 = 2337^2 + 728^2 .

It is a cyclic number.

It is not a de Polignac number, because 5991553 - 2¹ = 5991551 is a prime.

Together with 5991551, it forms a pair of twin primes.

5991553 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (5991551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2995776 + 2995777.

It is an arithmetic number, because the mean of its divisors is an integer number (2995777).

Almost surely, 2^5991553 is an apocalyptic number.

It is an amenable number.

5991553 is a deficient number, since it is larger than the sum of its proper divisors (1).

5991553 is an equidigital number, since it uses as much as digits as its factorization.

5991553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30375, while the sum is 37.

The square root of 5991553 is about 2447.7648988414. The cubic root of 5991553 is about 181.6267458036.

The spelling of 5991553 in words is "five million, nine hundred ninety-one thousand, five hundred fifty-three".