285985919 has 2 divisors, whose sum is σ = 285985920. Its totient is φ = 285985918.

The previous prime is 285985877. The next prime is 285985939. The reversal of 285985919 is 919589582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285985919 - 2²⁰ = 284937343 is a prime.

It is a super-2 number, since 2×285985919² = 163575891732549122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285985939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142992959 + 142992960.

It is an arithmetic number, because the mean of its divisors is an integer number (142992960).

Almost surely, 2^285985919 is an apocalyptic number.

285985919 is a deficient number, since it is larger than the sum of its proper divisors (1).

285985919 is an equidigital number, since it uses as much as digits as its factorization.

285985919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 56.

The square root of 285985919 is about 16911.1182066710. The cubic root of 285985919 is about 658.8424145570.

The spelling of 285985919 in words is "two hundred eighty-five million, nine hundred eighty-five thousand, nine hundred nineteen".