505545121 has 2 divisors, whose sum is σ = 505545122. Its totient is φ = 505545120.

The previous prime is 505545013. The next prime is 505545137. The reversal of 505545121 is 121545505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 301369600 + 204175521 = 17360^2 + 14289^2 .

It is a cyclic number.

It is not a de Polignac number, because 505545121 - 2²¹ = 503447969 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505545121.

It is not a weakly prime, because it can be changed into another prime (505545421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252772560 + 252772561.

It is an arithmetic number, because the mean of its divisors is an integer number (252772561).

Almost surely, 2^505545121 is an apocalyptic number.

It is an amenable number.

505545121 is a deficient number, since it is larger than the sum of its proper divisors (1).

505545121 is an equidigital number, since it uses as much as digits as its factorization.

505545121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 505545121 is about 22484.3305659742. The cubic root of 505545121 is about 796.6238559614.

It can be divided in two parts, 5055 and 45121, that added together give a square (50176 = 224²).

The spelling of 505545121 in words is "five hundred five million, five hundred forty-five thousand, one hundred twenty-one".