513843661 has 8 divisors (see below), whose sum is σ = 519832800. Its totient is φ = 507872400.

The previous prime is 513843653. The next prime is 513843691. The reversal of 513843661 is 166348315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 513843661 - 2³ = 513843653 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 513843661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513843641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58410 + ... + 66628.

It is an arithmetic number, because the mean of its divisors is an integer number (64979100).

Almost surely, 2^513843661 is an apocalyptic number.

It is an amenable number.

513843661 is a deficient number, since it is larger than the sum of its proper divisors (5989139).

513843661 is a wasteful number, since it uses less digits than its factorization.

513843661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8939.

The product of its digits is 51840, while the sum is 37.

The square root of 513843661 is about 22668.1199264518. The cubic root of 513843661 is about 800.9590898281.

The spelling of 513843661 in words is "five hundred thirteen million, eight hundred forty-three thousand, six hundred sixty-one".