133828691 has 2 divisors, whose sum is σ = 133828692. Its totient is φ = 133828690.

The previous prime is 133828687. The next prime is 133828729. The reversal of 133828691 is 196828331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133828691 - 2² = 133828687 is a prime.

It is not a weakly prime, because it can be changed into another prime (133828661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66914345 + 66914346.

It is an arithmetic number, because the mean of its divisors is an integer number (66914346).

Almost surely, 2^133828691 is an apocalyptic number.

133828691 is a deficient number, since it is larger than the sum of its proper divisors (1).

133828691 is an equidigital number, since it uses as much as digits as its factorization.

133828691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 133828691 is about 11568.4351145693. The cubic root of 133828691 is about 511.5048351444.

The spelling of 133828691 in words is "one hundred thirty-three million, eight hundred twenty-eight thousand, six hundred ninety-one".