550421261 has 4 divisors (see below), whose sum is σ = 592761372. Its totient is φ = 508081152.

The previous prime is 550421233. The next prime is 550421293. The reversal of 550421261 is 162124055.

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

It can be written as a sum of positive squares in 2 ways, for example, as 227104900 + 323316361 = 15070^2 + 17981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-550421261 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 550421261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550421231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21170036 + ... + 21170061.

It is an arithmetic number, because the mean of its divisors is an integer number (148190343).

Almost surely, 2^550421261 is an apocalyptic number.

It is an amenable number.

550421261 is a deficient number, since it is larger than the sum of its proper divisors (42340111).

550421261 is a wasteful number, since it uses less digits than its factorization.

550421261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42340110.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 550421261 is about 23461.0583947102. The cubic root of 550421261 is about 819.5303978828.

The spelling of 550421261 in words is "five hundred fifty million, four hundred twenty-one thousand, two hundred sixty-one".