550642591 has 4 divisors (see below), whose sum is σ = 579623800. Its totient is φ = 521661384.

The previous prime is 550642567. The next prime is 550642613. The reversal of 550642591 is 195246055.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 550642591 - 2¹¹ = 550640543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 550642591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550642511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14490576 + ... + 14490613.

It is an arithmetic number, because the mean of its divisors is an integer number (144905950).

Almost surely, 2^550642591 is an apocalyptic number.

550642591 is a deficient number, since it is larger than the sum of its proper divisors (28981209).

550642591 is a wasteful number, since it uses less digits than its factorization.

550642591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28981208.

The product of its (nonzero) digits is 54000, while the sum is 37.

The square root of 550642591 is about 23465.7748859909. The cubic root of 550642591 is about 819.6402303383.

The spelling of 550642591 in words is "five hundred fifty million, six hundred forty-two thousand, five hundred ninety-one".