280555051 has 4 divisors (see below), whose sum is σ = 320634352. Its totient is φ = 240475752.

The previous prime is 280555049. The next prime is 280555057. The reversal of 280555051 is 150555082.

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 280555051 - 2¹ = 280555049 is a prime.

It is a super-2 number, since 2×280555051² = 157422273283225202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280555057) 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, 20039640 + ... + 20039653.

It is an arithmetic number, because the mean of its divisors is an integer number (80158588).

Almost surely, 2^280555051 is an apocalyptic number.

280555051 is a deficient number, since it is larger than the sum of its proper divisors (40079301).

280555051 is an equidigital number, since it uses as much as digits as its factorization.

280555051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40079300.

The product of its (nonzero) digits is 10000, while the sum is 31.

The square root of 280555051 is about 16749.7776403151. Note that the first 3 decimals coincide. The cubic root of 280555051 is about 654.6452644752.

Adding to 280555051 its sum of digits (31), we get a palindrome (280555082).

The spelling of 280555051 in words is "two hundred eighty million, five hundred fifty-five thousand, fifty-one".