654161 has 2 divisors, whose sum is σ = 654162. Its totient is φ = 654160.

The previous prime is 654149. The next prime is 654163. The reversal of 654161 is 161456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 640000 + 14161 = 800^2 + 119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654161 is a prime.

It is a super-2 number, since 2×654161² = 855853227842, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 654163, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 654161.

It is not a weakly prime, because it can be changed into another prime (654163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327080 + 327081.

It is an arithmetic number, because the mean of its divisors is an integer number (327081).

2⁶⁵⁴¹⁶¹ is an apocalyptic number.

It is an amenable number.

654161 is a deficient number, since it is larger than the sum of its proper divisors (1).

654161 is an equidigital number, since it uses as much as digits as its factorization.

654161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 654161 is about 808.8022007883. The cubic root of 654161 is about 86.8083596046.

The spelling of 654161 in words is "six hundred fifty-four thousand, one hundred sixty-one".