504311261 has 2 divisors, whose sum is σ = 504311262. Its totient is φ = 504311260.

The previous prime is 504311257. The next prime is 504311263. The reversal of 504311261 is 162113405.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 476548900 + 27762361 = 21830^2 + 5269^2 .

It is a cyclic number.

It is not a de Polignac number, because 504311261 - 2² = 504311257 is a prime.

Together with 504311263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (504311263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252155630 + 252155631.

It is an arithmetic number, because the mean of its divisors is an integer number (252155631).

Almost surely, 2^504311261 is an apocalyptic number.

It is an amenable number.

504311261 is a deficient number, since it is larger than the sum of its proper divisors (1).

504311261 is an equidigital number, since it uses as much as digits as its factorization.

504311261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 504311261 is about 22456.8755841056. The cubic root of 504311261 is about 795.9752339668.

Adding to 504311261 its reverse (162113405), we get a palindrome (666424666).

The spelling of 504311261 in words is "five hundred four million, three hundred eleven thousand, two hundred sixty-one".