513121266 has 48 divisors (see below), whose sum is σ = 1275393600. Its totient is φ = 146051424.

The previous prime is 513121181. The next prime is 513121321. The reversal of 513121266 is 662121315.

513121266 is a `hidden beast` number, since 513 + 121 + 26 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26325 + ... + 41463.

It is an arithmetic number, because the mean of its divisors is an integer number (26570700).

Almost surely, 2^513121266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 513121266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637696800).

513121266 is an abundant number, since it is smaller than the sum of its proper divisors (762272334).

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

513121266 is a wasteful number, since it uses less digits than its factorization.

513121266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15423 (or 15420 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 513121266 is about 22652.1801599758. The cubic root of 513121266 is about 800.5835669169.

The spelling of 513121266 in words is "five hundred thirteen million, one hundred twenty-one thousand, two hundred sixty-six".