513607081 has 8 divisors (see below), whose sum is σ = 572188680. Its totient is φ = 457750272.

The previous prime is 513607063. The next prime is 513607091. The reversal of 513607081 is 180706315.

It can be written as a sum of positive squares in 4 ways, for example, as 39891856 + 473715225 = 6316^2 + 21765^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513607081 is a prime.

It is a super-2 number, since 2×513607081² = 527584467306681122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513607051) 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, 680800 + ... + 681553.

It is an arithmetic number, because the mean of its divisors is an integer number (71523585).

Almost surely, 2^513607081 is an apocalyptic number.

It is an amenable number.

513607081 is a deficient number, since it is larger than the sum of its proper divisors (58581599).

513607081 is a wasteful number, since it uses less digits than its factorization.

513607081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362395.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 513607081 is about 22662.9009837664. The cubic root of 513607081 is about 800.8361471222.

The spelling of 513607081 in words is "five hundred thirteen million, six hundred seven thousand, eighty-one".