280551047 has 4 divisors (see below), whose sum is σ = 320629776. Its totient is φ = 240472320.

The previous prime is 280551031. The next prime is 280551053. The reversal of 280551047 is 740155082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 740155082 = 2 ⋅370077541.

It is a cyclic number.

It is not a de Polignac number, because 280551047 - 2⁴ = 280551031 is a prime.

It is a super-3 number, since 3×280551047³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280551247) 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, 20039354 + ... + 20039367.

It is an arithmetic number, because the mean of its divisors is an integer number (80157444).

Almost surely, 2^280551047 is an apocalyptic number.

280551047 is a deficient number, since it is larger than the sum of its proper divisors (40078729).

280551047 is an equidigital number, since it uses as much as digits as its factorization.

280551047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40078728.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 280551047 is about 16749.6581159139. The cubic root of 280551047 is about 654.6421501581.

The spelling of 280551047 in words is "two hundred eighty million, five hundred fifty-one thousand, forty-seven".