254720161 has 2 divisors, whose sum is σ = 254720162. Its totient is φ = 254720160.

The previous prime is 254720159. The next prime is 254720171. The reversal of 254720161 is 161027452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226683136 + 28037025 = 15056^2 + 5295^2 .

It is a cyclic number.

It is not a de Polignac number, because 254720161 - 2¹ = 254720159 is a prime.

Together with 254720159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (254720171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127360080 + 127360081.

It is an arithmetic number, because the mean of its divisors is an integer number (127360081).

Almost surely, 2^254720161 is an apocalyptic number.

It is an amenable number.

254720161 is a deficient number, since it is larger than the sum of its proper divisors (1).

254720161 is an equidigital number, since it uses as much as digits as its factorization.

254720161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 254720161 is about 15959.9549184827. The cubic root of 254720161 is about 633.9005182803.

The spelling of 254720161 in words is "two hundred fifty-four million, seven hundred twenty thousand, one hundred sixty-one".