491212361 has 2 divisors, whose sum is σ = 491212362. Its totient is φ = 491212360.

The previous prime is 491212327. The next prime is 491212373. The reversal of 491212361 is 163212194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490356736 + 855625 = 22144^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 491212361 - 2¹⁸ = 490950217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (491212061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245606180 + 245606181.

It is an arithmetic number, because the mean of its divisors is an integer number (245606181).

Almost surely, 2^491212361 is an apocalyptic number.

It is an amenable number.

491212361 is a deficient number, since it is larger than the sum of its proper divisors (1).

491212361 is an equidigital number, since it uses as much as digits as its factorization.

491212361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 491212361 is about 22163.3111470286. The cubic root of 491212361 is about 789.0231803308.

The spelling of 491212361 in words is "four hundred ninety-one million, two hundred twelve thousand, three hundred sixty-one".