135287993 has 2 divisors, whose sum is σ = 135287994. Its totient is φ = 135287992.

The previous prime is 135287983. The next prime is 135288011. The reversal of 135287993 is 399782531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132894784 + 2393209 = 11528^2 + 1547^2 .

It is a cyclic number.

It is not a de Polignac number, because 135287993 - 2²² = 131093689 is a prime.

It is not a weakly prime, because it can be changed into another prime (135287963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67643996 + 67643997.

It is an arithmetic number, because the mean of its divisors is an integer number (67643997).

Almost surely, 2^135287993 is an apocalyptic number.

It is an amenable number.

135287993 is a deficient number, since it is larger than the sum of its proper divisors (1).

135287993 is an equidigital number, since it uses as much as digits as its factorization.

135287993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The square root of 135287993 is about 11631.3366815685. The cubic root of 135287993 is about 513.3573109150.

The spelling of 135287993 in words is "one hundred thirty-five million, two hundred eighty-seven thousand, nine hundred ninety-three".