505541261 has 2 divisors, whose sum is σ = 505541262. Its totient is φ = 505541260.

The previous prime is 505541251. The next prime is 505541263. The reversal of 505541261 is 162145505.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399760036 + 105781225 = 19994^2 + 10285^2 .

It is a cyclic number.

It is not a de Polignac number, because 505541261 - 2²² = 501346957 is a prime.

Together with 505541263, 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 (505541263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252770630 + 252770631.

It is an arithmetic number, because the mean of its divisors is an integer number (252770631).

Almost surely, 2^505541261 is an apocalyptic number.

It is an amenable number.

505541261 is a deficient number, since it is larger than the sum of its proper divisors (1).

505541261 is an equidigital number, since it uses as much as digits as its factorization.

505541261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 505541261 is about 22484.2447282536. The cubic root of 505541261 is about 796.6218284629.

Adding to 505541261 its reverse (162145505), we get a palindrome (667686766).

It can be divided in two parts, 50554 and 1261, that added together give a palindrome (51815).

The spelling of 505541261 in words is "five hundred five million, five hundred forty-one thousand, two hundred sixty-one".