505042129 has 2 divisors, whose sum is σ = 505042130. Its totient is φ = 505042128.

The previous prime is 505042123. The next prime is 505042147. The reversal of 505042129 is 921240505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505035729 + 6400 = 22473^2 + 80^2 .

It is a cyclic number.

It is not a de Polignac number, because 505042129 - 2³ = 505042121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 505042097 and 505042106.

It is not a weakly prime, because it can be changed into another prime (505042121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252521064 + 252521065.

It is an arithmetic number, because the mean of its divisors is an integer number (252521065).

Almost surely, 2^505042129 is an apocalyptic number.

It is an amenable number.

505042129 is a deficient number, since it is larger than the sum of its proper divisors (1).

505042129 is an equidigital number, since it uses as much as digits as its factorization.

505042129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 505042129 is about 22473.1423926428. The cubic root of 505042129 is about 796.3595680512.

The spelling of 505042129 in words is "five hundred five million, forty-two thousand, one hundred twenty-nine".