133865873 has 2 divisors, whose sum is σ = 133865874. Its totient is φ = 133865872.

The previous prime is 133865807. The next prime is 133865899. The reversal of 133865873 is 378568331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129572689 + 4293184 = 11383^2 + 2072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133865873 is a prime.

It is not a weakly prime, because it can be changed into another prime (133861873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66932936 + 66932937.

It is an arithmetic number, because the mean of its divisors is an integer number (66932937).

Almost surely, 2^133865873 is an apocalyptic number.

It is an amenable number.

133865873 is a deficient number, since it is larger than the sum of its proper divisors (1).

133865873 is an equidigital number, since it uses as much as digits as its factorization.

133865873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 133865873 is about 11570.0420483246. The cubic root of 133865873 is about 511.5522016983.

The spelling of 133865873 in words is "one hundred thirty-three million, eight hundred sixty-five thousand, eight hundred seventy-three".