133681311 has 12 divisors (see below), whose sum is σ = 193201320. Its totient is φ = 89071920.

The previous prime is 133681297. The next prime is 133681337. The reversal of 133681311 is 113186331.

It is not a de Polignac number, because 133681311 - 2¹¹ = 133679263 is a prime.

It is a super-3 number, since 3×133681311³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133681381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21960 + ... + 27378.

It is an arithmetic number, because the mean of its divisors is an integer number (16100110).

Almost surely, 2^133681311 is an apocalyptic number.

133681311 is a deficient number, since it is larger than the sum of its proper divisors (59520009).

133681311 is a wasteful number, since it uses less digits than its factorization.

133681311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8166 (or 8163 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 133681311 is about 11562.0634404072. The cubic root of 133681311 is about 511.3169998056.

The spelling of 133681311 in words is "one hundred thirty-three million, six hundred eighty-one thousand, three hundred eleven".