161167261 has 2 divisors, whose sum is σ = 161167262. Its totient is φ = 161167260.

The previous prime is 161167249. The next prime is 161167289. The reversal of 161167261 is 162761161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89019225 + 72148036 = 9435^2 + 8494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161167261 is a 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 (161167241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80583630 + 80583631.

It is an arithmetic number, because the mean of its divisors is an integer number (80583631).

Almost surely, 2^161167261 is an apocalyptic number.

It is an amenable number.

161167261 is a deficient number, since it is larger than the sum of its proper divisors (1).

161167261 is an equidigital number, since it uses as much as digits as its factorization.

161167261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 161167261 is about 12695.1668362413. The cubic root of 161167261 is about 544.2005066194.

The spelling of 161167261 in words is "one hundred sixty-one million, one hundred sixty-seven thousand, two hundred sixty-one".