505555091 has 2 divisors, whose sum is σ = 505555092. Its totient is φ = 505555090.

The previous prime is 505555067. The next prime is 505555117. The reversal of 505555091 is 190555505.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505555091 is a prime.

It is a Chen prime.

It is equal to p_26632637 and since 505555091 and 26632637 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (505555031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252777545 + 252777546.

It is an arithmetic number, because the mean of its divisors is an integer number (252777546).

Almost surely, 2^505555091 is an apocalyptic number.

505555091 is a deficient number, since it is larger than the sum of its proper divisors (1).

505555091 is an equidigital number, since it uses as much as digits as its factorization.

505555091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28125, while the sum is 35.

The square root of 505555091 is about 22484.5522748397. The cubic root of 505555091 is about 796.6290927427.

The spelling of 505555091 in words is "five hundred five million, five hundred fifty-five thousand, ninety-one".