551211540 has 96 divisors (see below), whose sum is σ = 1700576640. Its totient is φ = 132288000.

The previous prime is 551211523. The next prime is 551211541. The reversal of 551211540 is 45112155.

It is a self number, because there is not a number n which added to its sum of digits gives 551211540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551211541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62526 + ... + 70794.

It is an arithmetic number, because the mean of its divisors is an integer number (17714340).

Almost surely, 2^551211540 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 551211540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (850288320).

551211540 is an abundant number, since it is smaller than the sum of its proper divisors (1149365100).

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

551211540 is a wasteful number, since it uses less digits than its factorization.

551211540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8393 (or 8391 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 551211540 is about 23477.8947097051. The cubic root of 551211540 is about 819.9224297037.

Adding to 551211540 its reverse (45112155), we get a palindrome (596323695).

It can be divided in two parts, 5512115 and 40, that added together give a palindrome (5512155).

The spelling of 551211540 in words is "five hundred fifty-one million, two hundred eleven thousand, five hundred forty".