505840913 has 2 divisors, whose sum is σ = 505840914. Its totient is φ = 505840912.

The previous prime is 505840897. The next prime is 505840943. The reversal of 505840913 is 319048505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262699264 + 243141649 = 16208^2 + 15593^2 .

It is a cyclic number.

It is not a de Polignac number, because 505840913 - 2⁴ = 505840897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505840943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252920456 + 252920457.

It is an arithmetic number, because the mean of its divisors is an integer number (252920457).

Almost surely, 2^505840913 is an apocalyptic number.

It is an amenable number.

505840913 is a deficient number, since it is larger than the sum of its proper divisors (1).

505840913 is an equidigital number, since it uses as much as digits as its factorization.

505840913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 505840913 is about 22490.9073405232. The cubic root of 505840913 is about 796.7791925888.

The spelling of 505840913 in words is "five hundred five million, eight hundred forty thousand, nine hundred thirteen".