5517751991 has 2 divisors, whose sum is σ = 5517751992. Its totient is φ = 5517751990.

The previous prime is 5517751973. The next prime is 5517752017. The reversal of 5517751991 is 1991577155.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5517751991 - 2³⁰ = 4444010167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5517751901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2758875995 + 2758875996.

It is an arithmetic number, because the mean of its divisors is an integer number (2758875996).

Almost surely, 2^5517751991 is an apocalyptic number.

5517751991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5517751991 is an equidigital number, since it uses as much as digits as its factorization.

5517751991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 496125, while the sum is 50.

The square root of 5517751991 is about 74281.5723514251. The cubic root of 5517751991 is about 1767.0712405862.

The spelling of 5517751991 in words is "five billion, five hundred seventeen million, seven hundred fifty-one thousand, nine hundred ninety-one".