513672661 has 4 divisors (see below), whose sum is σ = 523364652. Its totient is φ = 503980672.

The previous prime is 513672647. The next prime is 513672671. The reversal of 513672661 is 166276315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 451562500 + 62110161 = 21250^2 + 7881^2 .

It is a cyclic number.

It is not a de Polignac number, because 513672661 - 2²³ = 505284053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 513672661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513672671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4845916 + ... + 4846021.

It is an arithmetic number, because the mean of its divisors is an integer number (130841163).

Almost surely, 2^513672661 is an apocalyptic number.

It is an amenable number.

513672661 is a deficient number, since it is larger than the sum of its proper divisors (9691991).

513672661 is an equidigital number, since it uses as much as digits as its factorization.

513672661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9691990.

The product of its digits is 45360, while the sum is 37.

The square root of 513672661 is about 22664.3477956018. The cubic root of 513672661 is about 800.8702306342.

The spelling of 513672661 in words is "five hundred thirteen million, six hundred seventy-two thousand, six hundred sixty-one".