133491131 has 8 divisors (see below), whose sum is σ = 140651280. Its totient is φ = 126344448.

The previous prime is 133491107. The next prime is 133491143. The reversal of 133491131 is 131194331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133491131 is a prime.

It is a super-2 number, since 2×133491131² = 35639764111318322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133491131.

It is not an unprimeable number, because it can be changed into a prime (133491151) 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 7 ways as a sum of consecutive naturals, for example, 21935 + ... + 27351.

It is an arithmetic number, because the mean of its divisors is an integer number (17581410).

Almost surely, 2^133491131 is an apocalyptic number.

133491131 is a deficient number, since it is larger than the sum of its proper divisors (7160149).

133491131 is a wasteful number, since it uses less digits than its factorization.

133491131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6733.

The product of its digits is 972, while the sum is 26.

The square root of 133491131 is about 11553.8362027510. The cubic root of 133491131 is about 511.0744118770.

The spelling of 133491131 in words is "one hundred thirty-three million, four hundred ninety-one thousand, one hundred thirty-one".