135805987 has 2 divisors, whose sum is σ = 135805988. Its totient is φ = 135805986.

The previous prime is 135805937. The next prime is 135805991. The reversal of 135805987 is 789508531.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135805987 is a prime.

It is a super-2 number, since 2×135805987² = 36886532210088338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (135805907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67902993 + 67902994.

It is an arithmetic number, because the mean of its divisors is an integer number (67902994).

Almost surely, 2^135805987 is an apocalyptic number.

135805987 is a deficient number, since it is larger than the sum of its proper divisors (1).

135805987 is an equidigital number, since it uses as much as digits as its factorization.

135805987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 46.

The square root of 135805987 is about 11653.5825821933. The cubic root of 135805987 is about 514.0116615320.

The spelling of 135805987 in words is "one hundred thirty-five million, eight hundred five thousand, nine hundred eighty-seven".