505393891 has 2 divisors, whose sum is σ = 505393892. Its totient is φ = 505393890.

The previous prime is 505393877. The next prime is 505393897. The reversal of 505393891 is 198393505.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 505393891 - 2²⁷ = 371176163 is a prime.

It is not a weakly prime, because it can be changed into another prime (505393897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252696945 + 252696946.

It is an arithmetic number, because the mean of its divisors is an integer number (252696946).

Almost surely, 2^505393891 is an apocalyptic number.

505393891 is a deficient number, since it is larger than the sum of its proper divisors (1).

505393891 is an equidigital number, since it uses as much as digits as its factorization.

505393891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 43.

The square root of 505393891 is about 22480.9673057011. The cubic root of 505393891 is about 796.5444133719.

The spelling of 505393891 in words is "five hundred five million, three hundred ninety-three thousand, eight hundred ninety-one".