551721456 has 300 divisors, whose sum is σ = 1894555080. Its totient is φ = 153653760.

The previous prime is 551721439. The next prime is 551721463. The reversal of 551721456 is 654127155.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 551721456.

It is a congruent number.

It is an unprimeable number.

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 59 ways as a sum of consecutive naturals, for example, 2409150 + ... + 2409378.

Almost surely, 2^551721456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551721456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (947277540).

551721456 is an abundant number, since it is smaller than the sum of its proper divisors (1342833624).

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

551721456 is a wasteful number, since it uses less digits than its factorization.

551721456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286 (or 258 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 551721456 is about 23488.7516909690. The cubic root of 551721456 is about 820.1751836699.

The spelling of 551721456 in words is "five hundred fifty-one million, seven hundred twenty-one thousand, four hundred fifty-six".