133691407 has 2 divisors, whose sum is σ = 133691408. Its totient is φ = 133691406.

The previous prime is 133691381. The next prime is 133691431. The reversal of 133691407 is 704196331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133691407 - 2⁷ = 133691279 is a prime.

It is the 11563-rd Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133691507) by changing a digit.

It is a nontrivial repunit in base 11562.

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 as a sum of consecutive naturals, namely, 66845703 + 66845704.

It is an arithmetic number, because the mean of its divisors is an integer number (66845704).

Almost surely, 2^133691407 is an apocalyptic number.

133691407 is a deficient number, since it is larger than the sum of its proper divisors (1).

133691407 is an equidigital number, since it uses as much as digits as its factorization.

133691407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 133691407 is about 11562.5000324324. The cubic root of 133691407 is about 511.3298715287.

The spelling of 133691407 in words is "one hundred thirty-three million, six hundred ninety-one thousand, four hundred seven".