135940249 has 4 divisors (see below), whose sum is σ = 136105060. Its totient is φ = 135775440.

The previous prime is 135940247. The next prime is 135940261. The reversal of 135940249 is 942049531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 942049531 = 4391 ⋅214541.

It can be written as a sum of positive squares in 2 ways, for example, as 89113600 + 46826649 = 9440^2 + 6843^2 .

It is a cyclic number.

It is not a de Polignac number, because 135940249 - 2¹ = 135940247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135940241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81162 + ... + 82819.

It is an arithmetic number, because the mean of its divisors is an integer number (34026265).

Almost surely, 2^135940249 is an apocalyptic number.

It is an amenable number.

135940249 is a deficient number, since it is larger than the sum of its proper divisors (164811).

135940249 is an equidigital number, since it uses as much as digits as its factorization.

135940249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164810.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 135940249 is about 11659.3417052593. The cubic root of 135940249 is about 514.1809950181.

The spelling of 135940249 in words is "one hundred thirty-five million, nine hundred forty thousand, two hundred forty-nine".