133493861 has 2 divisors, whose sum is σ = 133493862. Its totient is φ = 133493860.

The previous prime is 133493851. The next prime is 133493879. The reversal of 133493861 is 168394331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79103236 + 54390625 = 8894^2 + 7375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133493861 is a prime.

It is a super-2 number, since 2×133493861² = 35641221849374642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133493851) 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, 66746930 + 66746931.

It is an arithmetic number, because the mean of its divisors is an integer number (66746931).

Almost surely, 2^133493861 is an apocalyptic number.

It is an amenable number.

133493861 is a deficient number, since it is larger than the sum of its proper divisors (1).

133493861 is an equidigital number, since it uses as much as digits as its factorization.

133493861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 38.

The square root of 133493861 is about 11553.9543447254. The cubic root of 133493861 is about 511.0778958129.

The spelling of 133493861 in words is "one hundred thirty-three million, four hundred ninety-three thousand, eight hundred sixty-one".