509031161 has 2 divisors, whose sum is σ = 509031162.
Its totient is φ = 509031160.
The previous prime is 509031151. The next prime is 509031169. The reversal of 509031161 is 161130905.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 309091561 + 199939600 = 17581^2 + 14140^2
It is a cyclic number.
It is not a de Polignac number, because 509031161 - 26 = 509031097 is a prime.
It is a super-2 number, since 2×5090311612 = 518225445738015842, which contains 22 as substring.
It is a self number, because there is not a number n which added to its sum of digits gives 509031161.
It is not a weakly prime, because it can be changed into another prime (509031169) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254515580 + 254515581.
It is an arithmetic number, because the mean of its divisors is an integer number (254515581).
Almost surely, 2509031161 is an apocalyptic number.
It is an amenable number.
509031161 is a deficient number, since it is larger than the sum of its proper divisors (1).
509031161 is an equidigital number, since it uses as much as digits as its factorization.
509031161 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 810, while the sum is 26.
The square root of 509031161 is about 22561.7189283086.
The cubic root of 509031161 is about 798.4507313325.
The spelling of 509031161 in words is "five hundred nine million, thirty-one thousand, one hundred sixty-one".