551315856 has 360 divisors, whose sum is σ = 1914297120. Its totient is φ = 135862272.

The previous prime is 551315833. The next prime is 551315953. The reversal of 551315856 is 658513155.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7552236 + ... + 7552308.

It is an arithmetic number, because the mean of its divisors is an integer number (5317492).

Almost surely, 2^551315856 is an apocalyptic number.

551315856 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551315856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (957148560).

551315856 is an abundant number, since it is smaller than the sum of its proper divisors (1362981264).

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

551315856 is a wasteful number, since it uses less digits than its factorization.

551315856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 117 counting only the distinct ones).

The product of its digits is 90000, while the sum is 39.

The square root of 551315856 is about 23480.1161836989. The cubic root of 551315856 is about 819.9741494924.

The spelling of 551315856 in words is "five hundred fifty-one million, three hundred fifteen thousand, eight hundred fifty-six".