491826161 has 2 divisors, whose sum is σ = 491826162. Its totient is φ = 491826160.

The previous prime is 491826149. The next prime is 491826173. The reversal of 491826161 is 161628194.

It is a balanced prime because it is at equal distance from previous prime (491826149) and next prime (491826173).

It can be written as a sum of positive squares in only one way, i.e., 344325136 + 147501025 = 18556^2 + 12145^2 .

It is a cyclic number.

It is not a de Polignac number, because 491826161 - 2²² = 487631857 is a prime.

It is not a weakly prime, because it can be changed into another prime (491823161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245913080 + 245913081.

It is an arithmetic number, because the mean of its divisors is an integer number (245913081).

Almost surely, 2^491826161 is an apocalyptic number.

It is an amenable number.

491826161 is a deficient number, since it is larger than the sum of its proper divisors (1).

491826161 is an equidigital number, since it uses as much as digits as its factorization.

491826161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 491826161 is about 22177.1540329232. The cubic root of 491826161 is about 789.3516878390.

The spelling of 491826161 in words is "four hundred ninety-one million, eight hundred twenty-six thousand, one hundred sixty-one".