550440401 has 4 divisors (see below), whose sum is σ = 629074752. Its totient is φ = 471806052.

The previous prime is 550440391. The next prime is 550440409. The reversal of 550440401 is 104044055.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 550440401 - 2⁶ = 550440337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (550440409) 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, 39317165 + ... + 39317178.

It is an arithmetic number, because the mean of its divisors is an integer number (157268688).

Almost surely, 2^550440401 is an apocalyptic number.

It is an amenable number.

550440401 is a deficient number, since it is larger than the sum of its proper divisors (78634351).

550440401 is an equidigital number, since it uses as much as digits as its factorization.

550440401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78634350.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 550440401 is about 23461.4663011501. The cubic root of 550440401 is about 819.5398970496.

Adding to 550440401 its reverse (104044055), we get a palindrome (654484456).

The spelling of 550440401 in words is "five hundred fifty million, four hundred forty thousand, four hundred one".