550559691 has 12 divisors (see below), whose sum is σ = 867548760. Its totient is φ = 333672480.

The previous prime is 550559663. The next prime is 550559699. The reversal of 550559691 is 196955055.

550559691 is a `hidden beast` number, since 5 + 5 + 0 + 559 + 6 + 91 = 666.

It is not a de Polignac number, because 550559691 - 2¹⁴ = 550543307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (550559699) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2780506 + ... + 2780703.

It is an arithmetic number, because the mean of its divisors is an integer number (72295730).

Almost surely, 2^550559691 is an apocalyptic number.

550559691 is a deficient number, since it is larger than the sum of its proper divisors (316989069).

550559691 is a wasteful number, since it uses less digits than its factorization.

550559691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561226 (or 5561223 counting only the distinct ones).

The product of its (nonzero) digits is 303750, while the sum is 45.

The square root of 550559691 is about 23464.0084171482. The cubic root of 550559691 is about 819.5990956190.

It can be divided in two parts, 55055 and 9691, that added together give a palindrome (64746).

The spelling of 550559691 in words is "five hundred fifty million, five hundred fifty-nine thousand, six hundred ninety-one".