135609857 has 2 divisors, whose sum is σ = 135609858. Its totient is φ = 135609856.

The previous prime is 135609853. The next prime is 135609869. The reversal of 135609857 is 758906531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132733441 + 2876416 = 11521^2 + 1696^2 .

It is a cyclic number.

It is not a de Polignac number, because 135609857 - 2² = 135609853 is a prime.

It is not a weakly prime, because it can be changed into another prime (135609853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67804928 + 67804929.

It is an arithmetic number, because the mean of its divisors is an integer number (67804929).

Almost surely, 2^135609857 is an apocalyptic number.

It is an amenable number.

135609857 is a deficient number, since it is larger than the sum of its proper divisors (1).

135609857 is an equidigital number, since it uses as much as digits as its factorization.

135609857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 135609857 is about 11645.1645329725. The cubic root of 135609857 is about 513.7640983733.

The spelling of 135609857 in words is "one hundred thirty-five million, six hundred nine thousand, eight hundred fifty-seven".