516135781 has 16 divisors (see below), whose sum is σ = 597602304. Its totient is φ = 436632624.

The previous prime is 516135733. The next prime is 516135791. The reversal of 516135781 is 187531615.

It is a cyclic number.

It is not a de Polignac number, because 516135781 - 2¹¹ = 516133733 is a prime.

It is a super-2 number, since 2×516135781² = 532792288856959922, which contains 22 as substring.

It is a Duffinian number.

516135781 is a Rhonda number in base 10.

Its product of digits (25200) is a multiple of the sum of its prime divisors (2520).

It is a self number, because there is not a number n which added to its sum of digits gives 516135781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516135721) 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 15 ways as a sum of consecutive naturals, for example, 249156 + ... + 251218.

It is an arithmetic number, because the mean of its divisors is an integer number (37350144).

Almost surely, 2^516135781 is an apocalyptic number.

It is an amenable number.

516135781 is a deficient number, since it is larger than the sum of its proper divisors (81466523).

516135781 is a wasteful number, since it uses less digits than its factorization.

516135781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2520.

The product of its digits is 25200, while the sum is 37.

The square root of 516135781 is about 22718.6218992262. The cubic root of 516135781 is about 802.1482785644.

The spelling of 516135781 in words is "five hundred sixteen million, one hundred thirty-five thousand, seven hundred eighty-one".