135131947 has 4 divisors (see below), whose sum is σ = 135155736. Its totient is φ = 135108160.

The previous prime is 135131921. The next prime is 135131951. The reversal of 135131947 is 749131531.

It is a happy number.

135131947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749131531 = 383 ⋅1955957.

It is a cyclic number.

It is not a de Polignac number, because 135131947 - 2¹⁵ = 135099179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135135947) 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, 2172 + ... + 16582.

It is an arithmetic number, because the mean of its divisors is an integer number (33788934).

Almost surely, 2^135131947 is an apocalyptic number.

135131947 is a deficient number, since it is larger than the sum of its proper divisors (23789).

135131947 is an equidigital number, since it uses as much as digits as its factorization.

135131947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23788.

The product of its digits is 11340, while the sum is 34.

The square root of 135131947 is about 11624.6267466960. The cubic root of 135131947 is about 513.1598600980.

The spelling of 135131947 in words is "one hundred thirty-five million, one hundred thirty-one thousand, nine hundred forty-seven".