280625161 has 2 divisors, whose sum is σ = 280625162. Its totient is φ = 280625160.

The previous prime is 280625159. The next prime is 280625173. The reversal of 280625161 is 161526082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160503561 + 120121600 = 12669^2 + 10960^2 .

It is a cyclic number.

It is not a de Polignac number, because 280625161 - 2¹ = 280625159 is a prime.

Together with 280625159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (280625101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140312580 + 140312581.

It is an arithmetic number, because the mean of its divisors is an integer number (140312581).

Almost surely, 2^280625161 is an apocalyptic number.

It is an amenable number.

280625161 is a deficient number, since it is larger than the sum of its proper divisors (1).

280625161 is an equidigital number, since it uses as much as digits as its factorization.

280625161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 280625161 is about 16751.8703731852. The cubic root of 280625161 is about 654.6997913338.

The spelling of 280625161 in words is "two hundred eighty million, six hundred twenty-five thousand, one hundred sixty-one".