505185491 has 2 divisors, whose sum is σ = 505185492. Its totient is φ = 505185490.

The previous prime is 505185479. The next prime is 505185503. The reversal of 505185491 is 194581505.

It is a balanced prime because it is at equal distance from previous prime (505185479) and next prime (505185503).

It is a cyclic number.

It is not a de Polignac number, because 505185491 - 2²² = 500991187 is a prime.

It is a super-2 number, since 2×505185491² = 510424760633822162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505185451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252592745 + 252592746.

It is an arithmetic number, because the mean of its divisors is an integer number (252592746).

Almost surely, 2^505185491 is an apocalyptic number.

505185491 is a deficient number, since it is larger than the sum of its proper divisors (1).

505185491 is an equidigital number, since it uses as much as digits as its factorization.

505185491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 38.

The square root of 505185491 is about 22476.3317959137. The cubic root of 505185491 is about 796.4349128544.

The spelling of 505185491 in words is "five hundred five million, one hundred eighty-five thousand, four hundred ninety-one".