280620161 has 2 divisors, whose sum is σ = 280620162. Its totient is φ = 280620160.

The previous prime is 280620157. The next prime is 280620163. The reversal of 280620161 is 161026082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257281600 + 23338561 = 16040^2 + 4831^2 .

It is a cyclic number.

It is not a de Polignac number, because 280620161 - 2² = 280620157 is a prime.

Together with 280620163, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 280620161.

It is not a weakly prime, because it can be changed into another prime (280620163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140310080 + 140310081.

It is an arithmetic number, because the mean of its divisors is an integer number (140310081).

Almost surely, 2^280620161 is an apocalyptic number.

It is an amenable number.

280620161 is a deficient number, since it is larger than the sum of its proper divisors (1).

280620161 is an equidigital number, since it uses as much as digits as its factorization.

280620161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 280620161 is about 16751.7211354535. The cubic root of 280620161 is about 654.6959029697.

The spelling of 280620161 in words is "two hundred eighty million, six hundred twenty thousand, one hundred sixty-one".