135943657 has 4 divisors (see below), whose sum is σ = 137345236. Its totient is φ = 134542080.

The previous prime is 135943609. The next prime is 135943663. The reversal of 135943657 is 756349531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71639296 + 64304361 = 8464^2 + 8019^2 .

It is a cyclic number.

It is not a de Polignac number, because 135943657 - 2²⁷ = 1725929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135943667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700644 + ... + 700837.

It is an arithmetic number, because the mean of its divisors is an integer number (34336309).

Almost surely, 2^135943657 is an apocalyptic number.

It is an amenable number.

135943657 is a deficient number, since it is larger than the sum of its proper divisors (1401579).

135943657 is an equidigital number, since it uses as much as digits as its factorization.

135943657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401578.

The product of its digits is 340200, while the sum is 43.

The square root of 135943657 is about 11659.4878532464. The cubic root of 135943657 is about 514.1852917936.

The spelling of 135943657 in words is "one hundred thirty-five million, nine hundred forty-three thousand, six hundred fifty-seven".