285920081 has 4 divisors (see below), whose sum is σ = 287977200. Its totient is φ = 283862964.

The previous prime is 285920051. The next prime is 285920137. The reversal of 285920081 is 180029582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 180029582 = 2 ⋅90014791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285920081 is a prime.

It is a super-2 number, since 2×285920081² = 163500585438093122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285920051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1028351 + ... + 1028628.

It is an arithmetic number, because the mean of its divisors is an integer number (71994300).

Almost surely, 2^285920081 is an apocalyptic number.

It is an amenable number.

285920081 is a deficient number, since it is larger than the sum of its proper divisors (2057119).

285920081 is a wasteful number, since it uses less digits than its factorization.

285920081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057118.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 285920081 is about 16909.1715054286. The cubic root of 285920081 is about 658.7918523987.

The spelling of 285920081 in words is "two hundred eighty-five million, nine hundred twenty thousand, eighty-one".