551721912 has 128 divisors (see below), whose sum is σ = 1627637760. Its totient is φ = 152570880.

The previous prime is 551721857. The next prime is 551721931. The reversal of 551721912 is 219127155.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1191393 + ... + 1191855.

It is an arithmetic number, because the mean of its divisors is an integer number (12715920).

Almost surely, 2^551721912 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 551721912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (813818880).

551721912 is an abundant number, since it is smaller than the sum of its proper divisors (1075915848).

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

551721912 is a wasteful number, since it uses less digits than its factorization.

551721912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 689 counting only the distinct ones).

The product of its digits is 6300, while the sum is 33.

The square root of 551721912 is about 23488.7613977408. The cubic root of 551721912 is about 820.1754096292.

The spelling of 551721912 in words is "five hundred fifty-one million, seven hundred twenty-one thousand, nine hundred twelve".