133309987 has 2 divisors, whose sum is σ = 133309988. Its totient is φ = 133309986.

The previous prime is 133309963. The next prime is 133309991. The reversal of 133309987 is 789903331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133309987 - 2¹¹ = 133307939 is a prime.

It is not a weakly prime, because it can be changed into another prime (133309997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66654993 + 66654994.

It is an arithmetic number, because the mean of its divisors is an integer number (66654994).

Almost surely, 2^133309987 is an apocalyptic number.

133309987 is a deficient number, since it is larger than the sum of its proper divisors (1).

133309987 is an equidigital number, since it uses as much as digits as its factorization.

133309987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 133309987 is about 11545.9944136484. The cubic root of 133309987 is about 510.8431356628.

The spelling of 133309987 in words is "one hundred thirty-three million, three hundred nine thousand, nine hundred eighty-seven".