517991055 has 16 divisors (see below), whose sum is σ = 830114304. Its totient is φ = 275819040.

The previous prime is 517991041. The next prime is 517991057. The reversal of 517991055 is 550199715.

It is not a de Polignac number, because 517991055 - 2⁷ = 517990927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 517990998 and 517991016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517991057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17899 + ... + 36828.

It is an arithmetic number, because the mean of its divisors is an integer number (51882144).

Almost surely, 2^517991055 is an apocalyptic number.

517991055 is a deficient number, since it is larger than the sum of its proper divisors (312123249).

517991055 is a wasteful number, since it uses less digits than its factorization.

517991055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55366.

The product of its (nonzero) digits is 70875, while the sum is 42.

The square root of 517991055 is about 22759.4168422655. The cubic root of 517991055 is about 803.1082489908.

The spelling of 517991055 in words is "five hundred seventeen million, nine hundred ninety-one thousand, fifty-five".