505387613 has 2 divisors, whose sum is σ = 505387614. Its totient is φ = 505387612.

The previous prime is 505387609. The next prime is 505387621. The reversal of 505387613 is 316783505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 503463844 + 1923769 = 22438^2 + 1387^2 .

It is a cyclic number.

It is not a de Polignac number, because 505387613 - 2² = 505387609 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505687613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252693806 + 252693807.

It is an arithmetic number, because the mean of its divisors is an integer number (252693807).

Almost surely, 2^505387613 is an apocalyptic number.

It is an amenable number.

505387613 is a deficient number, since it is larger than the sum of its proper divisors (1).

505387613 is an equidigital number, since it uses as much as digits as its factorization.

505387613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 505387613 is about 22480.8276760443. The cubic root of 505387613 is about 796.5411151348.

The spelling of 505387613 in words is "five hundred five million, three hundred eighty-seven thousand, six hundred thirteen".