551444420 has 48 divisors (see below), whose sum is σ = 1189859328. Its totient is φ = 214573440.

The previous prime is 551444417. The next prime is 551444423. The reversal of 551444420 is 24444155.

It is an interprime number because it is at equal distance from previous prime (551444417) and next prime (551444423).

It is not an unprimeable number, because it can be changed into a prime (551444423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160925 + ... + 164315.

It is an arithmetic number, because the mean of its divisors is an integer number (24788736).

Almost surely, 2^551444420 is an apocalyptic number.

It is an amenable number.

551444420 is an abundant number, since it is smaller than the sum of its proper divisors (638414908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551444420 is a wasteful number, since it uses less digits than its factorization.

551444420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3620 (or 3618 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 29.

The square root of 551444420 is about 23482.8537448071. The cubic root of 551444420 is about 820.0378824458.

Adding to 551444420 its reverse (24444155), we get a palindrome (575888575).

The spelling of 551444420 in words is "five hundred fifty-one million, four hundred forty-four thousand, four hundred twenty".