281164085 has 4 divisors (see below), whose sum is σ = 337396908. Its totient is φ = 224931264.

The previous prime is 281164061. The next prime is 281164111. The reversal of 281164085 is 580461182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31460881 + 249703204 = 5609^2 + 15802^2 .

It is a cyclic number.

It is not a de Polignac number, because 281164085 - 2⁶ = 281164021 is a prime.

It is a super-5 number, since 5×281164085⁵ (a number of 43 digits) contains 55555 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28116404 + ... + 28116413.

It is an arithmetic number, because the mean of its divisors is an integer number (84349227).

Almost surely, 2^281164085 is an apocalyptic number.

It is an amenable number.

281164085 is a deficient number, since it is larger than the sum of its proper divisors (56232823).

281164085 is an equidigital number, since it uses as much as digits as its factorization.

281164085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56232822.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 281164085 is about 16767.9481451965. The cubic root of 281164085 is about 655.1186273884.

The spelling of 281164085 in words is "two hundred eighty-one million, one hundred sixty-four thousand, eighty-five".