513216722 has 18 divisors (see below), whose sum is σ = 783270117. Its totient is φ = 252203136.

The previous prime is 513216713. The next prime is 513216727. The reversal of 513216722 is 227612315.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 476505241 + 36711481 = 21829^2 + 6059^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=16019.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513216727) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2659058 + ... + 2659250.

Almost surely, 2^513216722 is an apocalyptic number.

513216722 is a deficient number, since it is larger than the sum of its proper divisors (270053395).

513216722 is an frugal number, since it uses more digits than its factorization.

513216722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554 (or 278 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 513216722 is about 22654.2870556546. The cubic root of 513216722 is about 800.6332080522.

The spelling of 513216722 in words is "five hundred thirteen million, two hundred sixteen thousand, seven hundred twenty-two".