520161409 has 2 divisors, whose sum is σ = 520161410. Its totient is φ = 520161408.

The previous prime is 520161379. The next prime is 520161419. The reversal of 520161409 is 904161025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453690000 + 66471409 = 21300^2 + 8153^2 .

It is a cyclic number.

It is not a de Polignac number, because 520161409 - 2⁵ = 520161377 is a prime.

It is not a weakly prime, because it can be changed into another prime (520161419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260080704 + 260080705.

It is an arithmetic number, because the mean of its divisors is an integer number (260080705).

Almost surely, 2^520161409 is an apocalyptic number.

It is an amenable number.

520161409 is a deficient number, since it is larger than the sum of its proper divisors (1).

520161409 is an equidigital number, since it uses as much as digits as its factorization.

520161409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 520161409 is about 22807.0473538334. The cubic root of 520161409 is about 804.2283458444.

Subtracting from 520161409 its product of nonzero digits (2160), we obtain a square (520159249 = 22807²).

The spelling of 520161409 in words is "five hundred twenty million, one hundred sixty-one thousand, four hundred nine".