505215511 has 2 divisors, whose sum is σ = 505215512. Its totient is φ = 505215510.

The previous prime is 505215509. The next prime is 505215527. The reversal of 505215511 is 115512505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505215511 - 2¹ = 505215509 is a prime.

It is a super-2 number, since 2×505215511² = 510485425109982242, which contains 22 as substring.

Together with 505215509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505215551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252607755 + 252607756.

It is an arithmetic number, because the mean of its divisors is an integer number (252607756).

Almost surely, 2^505215511 is an apocalyptic number.

505215511 is a deficient number, since it is larger than the sum of its proper divisors (1).

505215511 is an equidigital number, since it uses as much as digits as its factorization.

505215511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1250, while the sum is 25.

The square root of 505215511 is about 22476.9995995907. Note that the first 3 decimals coincide. The cubic root of 505215511 is about 796.4506882497.

The spelling of 505215511 in words is "five hundred five million, two hundred fifteen thousand, five hundred eleven".