550017621 has 12 divisors (see below), whose sum is σ = 823895072. Its totient is φ = 366678252.

The previous prime is 550017613. The next prime is 550017659. The reversal of 550017621 is 126710055.

It is not a de Polignac number, because 550017621 - 2³ = 550017613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550017661) 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, 1131481 + ... + 1131966.

Almost surely, 2^550017621 is an apocalyptic number.

It is an amenable number.

550017621 is a deficient number, since it is larger than the sum of its proper divisors (273877451).

550017621 is an equidigital number, since it uses as much as digits as its factorization.

550017621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263462 (or 2263450 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 550017621 is about 23452.4544770905. The cubic root of 550017621 is about 819.3300203618.

Adding to 550017621 its reverse (126710055), we get a palindrome (676727676).

The spelling of 550017621 in words is "five hundred fifty million, seventeen thousand, six hundred twenty-one".