133206691 has 2 divisors, whose sum is σ = 133206692. Its totient is φ = 133206690.

The previous prime is 133206683. The next prime is 133206709. The reversal of 133206691 is 196602331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133206691 - 2³ = 133206683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133206631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66603345 + 66603346.

It is an arithmetic number, because the mean of its divisors is an integer number (66603346).

Almost surely, 2^133206691 is an apocalyptic number.

133206691 is a deficient number, since it is larger than the sum of its proper divisors (1).

133206691 is an equidigital number, since it uses as much as digits as its factorization.

133206691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 133206691 is about 11541.5203071346. The cubic root of 133206691 is about 510.7111583348.

The spelling of 133206691 in words is "one hundred thirty-three million, two hundred six thousand, six hundred ninety-one".