511161605 has 6 divisors (see below), whose sum is σ = 613454598. Its totient is φ = 408888840.

The previous prime is 511161587. The next prime is 511161611. The reversal of 511161605 is 506161115.

It can be written as a sum of positive squares in only one way, i.e., 408929284 + 102232321 = 20222^2 + 10111^2 .

It is not a de Polignac number, because 511161605 - 2²⁸ = 242726149 is a prime.

It is a super-2 number, since 2×511161605² = 522572372852352050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 45500 + ... + 55610.

It is an arithmetic number, because the mean of its divisors is an integer number (102242433).

Almost surely, 2^511161605 is an apocalyptic number.

It is an amenable number.

511161605 is a deficient number, since it is larger than the sum of its proper divisors (102292993).

511161605 is an frugal number, since it uses more digits than its factorization.

511161605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20227 (or 10116 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 511161605 is about 22608.8833205004. The cubic root of 511161605 is about 799.5630973761.

The spelling of 511161605 in words is "five hundred eleven million, one hundred sixty-one thousand, six hundred five".