280533997 has 2 divisors, whose sum is σ = 280533998. Its totient is φ = 280533996.

The previous prime is 280533959. The next prime is 280534027. The reversal of 280533997 is 799335082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231617961 + 48916036 = 15219^2 + 6994^2 .

It is a cyclic number.

It is not a de Polignac number, because 280533997 - 2¹⁵ = 280501229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280533397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140266998 + 140266999.

It is an arithmetic number, because the mean of its divisors is an integer number (140266999).

Almost surely, 2^280533997 is an apocalyptic number.

It is an amenable number.

280533997 is a deficient number, since it is larger than the sum of its proper divisors (1).

280533997 is an equidigital number, since it uses as much as digits as its factorization.

280533997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 280533997 is about 16749.1491425684. The cubic root of 280533997 is about 654.6288883116.

The spelling of 280533997 in words is "two hundred eighty million, five hundred thirty-three thousand, nine hundred ninety-seven".