516261813 has 4 divisors (see below), whose sum is σ = 688349088. Its totient is φ = 344174540.

The previous prime is 516261773. The next prime is 516261821. The reversal of 516261813 is 318162615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 516261813 - 2²¹ = 514164661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516261883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86043633 + ... + 86043638.

It is an arithmetic number, because the mean of its divisors is an integer number (172087272).

Almost surely, 2^516261813 is an apocalyptic number.

It is an amenable number.

516261813 is a deficient number, since it is larger than the sum of its proper divisors (172087275).

516261813 is a wasteful number, since it uses less digits than its factorization.

516261813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172087274.

The product of its digits is 8640, while the sum is 33.

The square root of 516261813 is about 22721.3954897141. The cubic root of 516261813 is about 802.2135637910.

The spelling of 516261813 in words is "five hundred sixteen million, two hundred sixty-one thousand, eight hundred thirteen".