491261333 has 2 divisors, whose sum is σ = 491261334. Its totient is φ = 491261332.

The previous prime is 491261327. The next prime is 491261339. The reversal of 491261333 is 333162194.

It is a balanced prime because it is at equal distance from previous prime (491261327) and next prime (491261339).

It can be written as a sum of positive squares in only one way, i.e., 407959204 + 83302129 = 20198^2 + 9127^2 .

It is a cyclic number.

It is not a de Polignac number, because 491261333 - 2⁶ = 491261269 is a prime.

It is equal to p_25919402 and since 491261333 and 25919402 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491261333.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491261339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245630666 + 245630667.

It is an arithmetic number, because the mean of its divisors is an integer number (245630667).

Almost surely, 2^491261333 is an apocalyptic number.

It is an amenable number.

491261333 is a deficient number, since it is larger than the sum of its proper divisors (1).

491261333 is an equidigital number, since it uses as much as digits as its factorization.

491261333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 32.

The square root of 491261333 is about 22164.4159183138. The cubic root of 491261333 is about 789.0494003273.

The spelling of 491261333 in words is "four hundred ninety-one million, two hundred sixty-one thousand, three hundred thirty-three".