280155871 has 4 divisors (see below), whose sum is σ = 280483632. Its totient is φ = 279828112.

The previous prime is 280155857. The next prime is 280155881. The reversal of 280155871 is 178551082.

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

It is a cyclic number.

It is not a de Polignac number, because 280155871 - 2²³ = 271767263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280155871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280155881) 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 in 3 ways as a sum of consecutive naturals, for example, 162595 + ... + 164308.

It is an arithmetic number, because the mean of its divisors is an integer number (70120908).

Almost surely, 2^280155871 is an apocalyptic number.

280155871 is a deficient number, since it is larger than the sum of its proper divisors (327761).

280155871 is an equidigital number, since it uses as much as digits as its factorization.

280155871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327760.

The product of its (nonzero) digits is 22400, while the sum is 37.

The square root of 280155871 is about 16737.8574196341. The cubic root of 280155871 is about 654.3346357985.

The spelling of 280155871 in words is "two hundred eighty million, one hundred fifty-five thousand, eight hundred seventy-one".