531515226 has 64 divisors (see below), whose sum is σ = 1200116736. Its totient is φ = 155529600.

The previous prime is 531515213. The next prime is 531515287. The reversal of 531515226 is 622515135.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 531515193 and 531515202.

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, 277765 + ... + 279671.

It is an arithmetic number, because the mean of its divisors is an integer number (18751824).

Almost surely, 2^531515226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531515226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (600058368).

531515226 is an abundant number, since it is smaller than the sum of its proper divisors (668601510).

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

531515226 is a wasteful number, since it uses less digits than its factorization.

531515226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067.

The product of its digits is 9000, while the sum is 30.

The square root of 531515226 is about 23054.6139850573. The cubic root of 531515226 is about 810.0377089593.

Subtracting 531515226 from its reverse (622515135), we obtain a palindrome (90999909).

The spelling of 531515226 in words is "five hundred thirty-one million, five hundred fifteen thousand, two hundred twenty-six".