133943491 has 12 divisors (see below), whose sum is σ = 149012136. Its totient is φ = 120290720.

The previous prime is 133943479. The next prime is 133943497. The reversal of 133943491 is 194349331.

It is not a de Polignac number, because 133943491 - 2¹⁵ = 133910723 is a prime.

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 133943491.

It is not an unprimeable number, because it can be changed into a prime (133943497) 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 in 11 ways as a sum of consecutive naturals, for example, 3375 + ... + 16711.

It is an arithmetic number, because the mean of its divisors is an integer number (12417678).

Almost surely, 2^133943491 is an apocalyptic number.

133943491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

133943491 is a deficient number, since it is larger than the sum of its proper divisors (15068645).

133943491 is a wasteful number, since it uses less digits than its factorization.

133943491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13442 (or 13431 counting only the distinct ones).

The product of its digits is 34992, while the sum is 37.

The square root of 133943491 is about 11573.3958283643. The cubic root of 133943491 is about 511.6510518541.

The spelling of 133943491 in words is "one hundred thirty-three million, nine hundred forty-three thousand, four hundred ninety-one".