551421816 has 32 divisors (see below), whose sum is σ = 1503878400. Its totient is φ = 167097440.

The previous prime is 551421797. The next prime is 551421823. The reversal of 551421816 is 618124155.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1044096 + ... + 1044623.

It is an arithmetic number, because the mean of its divisors is an integer number (46996200).

Almost surely, 2^551421816 is an apocalyptic number.

It is an amenable number.

551421816 is an abundant number, since it is smaller than the sum of its proper divisors (952456584).

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

551421816 is a wasteful number, since it uses less digits than its factorization.

551421816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088739 (or 2088735 counting only the distinct ones).

The product of its digits is 9600, while the sum is 33.

The square root of 551421816 is about 23482.3724525441. The cubic root of 551421816 is about 820.0266776964.

The spelling of 551421816 in words is "five hundred fifty-one million, four hundred twenty-one thousand, eight hundred sixteen".