511940681 has 12 divisors (see below), whose sum is σ = 596348820. Its totient is φ = 438197760.

The previous prime is 511940677. The next prime is 511940711. The reversal of 511940681 is 186049115.

It can be written as a sum of positive squares in 2 ways, for example, as 60590656 + 451350025 = 7784^2 + 21245^2 .

It is not a de Polignac number, because 511940681 - 2² = 511940677 is a prime.

It is a super-2 number, since 2×511940681² = 524166521725487522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (511940651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30425 + ... + 44153.

It is an arithmetic number, because the mean of its divisors is an integer number (49695735).

Almost surely, 2^511940681 is an apocalyptic number.

It is an amenable number.

511940681 is a deficient number, since it is larger than the sum of its proper divisors (84408139).

511940681 is a wasteful number, since it uses less digits than its factorization.

511940681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14504 (or 14497 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 511940681 is about 22626.1061829030. The cubic root of 511940681 is about 799.9691034943.

Adding to 511940681 its reverse (186049115), we get a palindrome (697989796).

It can be divided in two parts, 511 and 940681, that added together give a cube (941192 = 98³).

The spelling of 511940681 in words is "five hundred eleven million, nine hundred forty thousand, six hundred eighty-one".