285117919 has 2 divisors, whose sum is σ = 285117920. Its totient is φ = 285117918.

The previous prime is 285117887. The next prime is 285117923. The reversal of 285117919 is 919711582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285117919 - 2⁵ = 285117887 is a prime.

It is a super-2 number, since 2×285117919² = 162584455469781122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285118919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142558959 + 142558960.

It is an arithmetic number, because the mean of its divisors is an integer number (142558960).

Almost surely, 2^285117919 is an apocalyptic number.

285117919 is a deficient number, since it is larger than the sum of its proper divisors (1).

285117919 is an equidigital number, since it uses as much as digits as its factorization.

285117919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 43.

The square root of 285117919 is about 16885.4351143226. The cubic root of 285117919 is about 658.1751850138.

The spelling of 285117919 in words is "two hundred eighty-five million, one hundred seventeen thousand, nine hundred nineteen".