135878731 has 4 divisors (see below), whose sum is σ = 135904264. Its totient is φ = 135853200.

The previous prime is 135878723. The next prime is 135878759. The reversal of 135878731 is 137878531.

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

It is a cyclic number.

It is not a de Polignac number, because 135878731 - 2³ = 135878723 is a prime.

It is a super-2 number, since 2×135878731² = 36926059076340722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135878761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1425 + ... + 16546.

It is an arithmetic number, because the mean of its divisors is an integer number (33976066).

Almost surely, 2^135878731 is an apocalyptic number.

135878731 is a deficient number, since it is larger than the sum of its proper divisors (25533).

135878731 is an equidigital number, since it uses as much as digits as its factorization.

135878731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25532.

The product of its digits is 141120, while the sum is 43.

The square root of 135878731 is about 11656.7032646456. The cubic root of 135878731 is about 514.1034213308.

It can be divided in two parts, 1358 and 78731, that added together give a square (80089 = 283²).

The spelling of 135878731 in words is "one hundred thirty-five million, eight hundred seventy-eight thousand, seven hundred thirty-one".