512020161 has 12 divisors (see below), whose sum is σ = 783089892. Its totient is φ = 321267456.

The previous prime is 512020141. The next prime is 512020169. The reversal of 512020161 is 161020215.

It can be written as a sum of positive squares in 2 ways, for example, as 476985600 + 35034561 = 21840^2 + 5919^2 .

It is not a de Polignac number, because 512020161 - 2⁵ = 512020129 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (512020169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1673116 + ... + 1673421.

It is an arithmetic number, because the mean of its divisors is an integer number (65257491).

Almost surely, 2^512020161 is an apocalyptic number.

512020161 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

512020161 is a deficient number, since it is larger than the sum of its proper divisors (271069731).

512020161 is a wasteful number, since it uses less digits than its factorization.

512020161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3346560 (or 3346557 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 512020161 is about 22627.8624929532. The cubic root of 512020161 is about 800.0105003830.

Adding to 512020161 its reverse (161020215), we get a palindrome (673040376).

It can be divided in two parts, 5120 and 20161, that added together give a square (25281 = 159²).

The spelling of 512020161 in words is "five hundred twelve million, twenty thousand, one hundred sixty-one".