135775397 has 2 divisors, whose sum is σ = 135775398. Its totient is φ = 135775396.

The previous prime is 135775373. The next prime is 135775399. The reversal of 135775397 is 793577531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87347716 + 48427681 = 9346^2 + 6959^2 .

It is a cyclic number.

It is not a de Polignac number, because 135775397 - 2⁶ = 135775333 is a prime.

Together with 135775399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135775399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67887698 + 67887699.

It is an arithmetic number, because the mean of its divisors is an integer number (67887699).

Almost surely, 2^135775397 is an apocalyptic number.

It is an amenable number.

135775397 is a deficient number, since it is larger than the sum of its proper divisors (1).

135775397 is an equidigital number, since it uses as much as digits as its factorization.

135775397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 694575, while the sum is 47.

The square root of 135775397 is about 11652.2700363491. The cubic root of 135775397 is about 513.9730653017.

The spelling of 135775397 in words is "one hundred thirty-five million, seven hundred seventy-five thousand, three hundred ninety-seven".