133357781 has 2 divisors, whose sum is σ = 133357782. Its totient is φ = 133357780.

The previous prime is 133357739. The next prime is 133357801. The reversal of 133357781 is 187753331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133287025 + 70756 = 11545^2 + 266^2 .

It is an emirp because it is prime and its reverse (187753331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133357781 - 2⁶ = 133357717 is a prime.

It is a super-2 number, since 2×133357781² = 35568595506487922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133357711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66678890 + 66678891.

It is an arithmetic number, because the mean of its divisors is an integer number (66678891).

Almost surely, 2^133357781 is an apocalyptic number.

It is an amenable number.

133357781 is a deficient number, since it is larger than the sum of its proper divisors (1).

133357781 is an equidigital number, since it uses as much as digits as its factorization.

133357781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 133357781 is about 11548.0639502905. The cubic root of 133357781 is about 510.9041771501.

The spelling of 133357781 in words is "one hundred thirty-three million, three hundred fifty-seven thousand, seven hundred eighty-one".