280985591 has 2 divisors, whose sum is σ = 280985592. Its totient is φ = 280985590.

The previous prime is 280985567. The next prime is 280985609. The reversal of 280985591 is 195589082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280985591 - 2⁶ = 280985527 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280985501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140492795 + 140492796.

It is an arithmetic number, because the mean of its divisors is an integer number (140492796).

Almost surely, 2^280985591 is an apocalyptic number.

280985591 is a deficient number, since it is larger than the sum of its proper divisors (1).

280985591 is an equidigital number, since it uses as much as digits as its factorization.

280985591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 47.

The square root of 280985591 is about 16762.6248242929. The cubic root of 280985591 is about 654.9799663667.

The spelling of 280985591 in words is "two hundred eighty million, nine hundred eighty-five thousand, five hundred ninety-one".