135678997 has 2 divisors, whose sum is σ = 135678998. Its totient is φ = 135678996.

The previous prime is 135678979. The next prime is 135679003. The reversal of 135678997 is 799876531.

Together with previous prime (135678979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134768881 + 910116 = 11609^2 + 954^2 .

It is an emirp because it is prime and its reverse (799876531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135678997 - 2⁷ = 135678869 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135678947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67839498 + 67839499.

It is an arithmetic number, because the mean of its divisors is an integer number (67839499).

Almost surely, 2^135678997 is an apocalyptic number.

It is an amenable number.

135678997 is a deficient number, since it is larger than the sum of its proper divisors (1).

135678997 is an equidigital number, since it uses as much as digits as its factorization.

135678997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 55.

The square root of 135678997 is about 11648.1327688175. The cubic root of 135678997 is about 513.8513968814.

The spelling of 135678997 in words is "one hundred thirty-five million, six hundred seventy-eight thousand, nine hundred ninety-seven".