550009391 has 4 divisors (see below), whose sum is σ = 555349392. Its totient is φ = 544669392.

The previous prime is 550009351. The next prime is 550009393. The reversal of 550009391 is 193900055.

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 550009391 - 2²⁶ = 482900527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550009393) 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, 2669846 + ... + 2670051.

It is an arithmetic number, because the mean of its divisors is an integer number (138837348).

Almost surely, 2^550009391 is an apocalyptic number.

550009391 is a deficient number, since it is larger than the sum of its proper divisors (5340001).

550009391 is a wasteful number, since it uses less digits than its factorization.

550009391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5340000.

The product of its (nonzero) digits is 6075, while the sum is 32.

The square root of 550009391 is about 23452.2790150552. The cubic root of 550009391 is about 819.3259337535.

The spelling of 550009391 in words is "five hundred fifty million, nine thousand, three hundred ninety-one".