135551239 has 4 divisors (see below), whose sum is σ = 139214824. Its totient is φ = 131887656.

The previous prime is 135551237. The next prime is 135551257. The reversal of 135551239 is 932155531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932155531 = 827 ⋅1127153.

It is a cyclic number.

It is not a de Polignac number, because 135551239 - 2¹ = 135551237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135551231) 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, 1831737 + ... + 1831810.

It is an arithmetic number, because the mean of its divisors is an integer number (34803706).

Almost surely, 2^135551239 is an apocalyptic number.

135551239 is a deficient number, since it is larger than the sum of its proper divisors (3663585).

135551239 is an equidigital number, since it uses as much as digits as its factorization.

135551239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663584.

The product of its digits is 20250, while the sum is 34.

The square root of 135551239 is about 11642.6474223005. The cubic root of 135551239 is about 513.6900620535.

The spelling of 135551239 in words is "one hundred thirty-five million, five hundred fifty-one thousand, two hundred thirty-nine".