513212661 has 24 divisors (see below), whose sum is σ = 799134336. Its totient is φ = 315505440.

The previous prime is 513212659. The next prime is 513212683. The reversal of 513212661 is 166212315.

It is not a de Polignac number, because 513212661 - 2¹ = 513212659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513212261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175336 + ... + 178238.

It is an arithmetic number, because the mean of its divisors is an integer number (33297264).

Almost surely, 2^513212661 is an apocalyptic number.

It is an amenable number.

513212661 is a deficient number, since it is larger than the sum of its proper divisors (285921675).

513212661 is a wasteful number, since it uses less digits than its factorization.

513212661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4433 (or 4430 counting only the distinct ones).

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

The square root of 513212661 is about 22654.1974256428. The cubic root of 513212661 is about 800.6310962868.

Adding to 513212661 its reverse (166212315), we get a palindrome (679424976).

The spelling of 513212661 in words is "five hundred thirteen million, two hundred twelve thousand, six hundred sixty-one".