280220947 has 2 divisors, whose sum is σ = 280220948. Its totient is φ = 280220946.

The previous prime is 280220929. The next prime is 280220951. The reversal of 280220947 is 749022082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280220947 - 2⁷ = 280220819 is a prime.

It is not a weakly prime, because it can be changed into another prime (280220917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140110473 + 140110474.

It is an arithmetic number, because the mean of its divisors is an integer number (140110474).

Almost surely, 2^280220947 is an apocalyptic number.

280220947 is a deficient number, since it is larger than the sum of its proper divisors (1).

280220947 is an equidigital number, since it uses as much as digits as its factorization.

280220947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 280220947 is about 16739.8012831694. The cubic root of 280220947 is about 654.3852959114.

The spelling of 280220947 in words is "two hundred eighty million, two hundred twenty thousand, nine hundred forty-seven".