285073981 has 2 divisors, whose sum is σ = 285073982. Its totient is φ = 285073980.

The previous prime is 285073933. The next prime is 285074021. The reversal of 285073981 is 189370582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175138756 + 109935225 = 13234^2 + 10485^2 .

It is a cyclic number.

It is not a de Polignac number, because 285073981 - 2⁹ = 285073469 is a prime.

It is a super-2 number, since 2×285073981² = 162534349286376722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285073181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142536990 + 142536991.

It is an arithmetic number, because the mean of its divisors is an integer number (142536991).

Almost surely, 2^285073981 is an apocalyptic number.

It is an amenable number.

285073981 is a deficient number, since it is larger than the sum of its proper divisors (1).

285073981 is an equidigital number, since it uses as much as digits as its factorization.

285073981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 285073981 is about 16884.1340020743. The cubic root of 285073981 is about 658.1413739892.

The spelling of 285073981 in words is "two hundred eighty-five million, seventy-three thousand, nine hundred eighty-one".