135799831 has 4 divisors (see below), whose sum is σ = 139112064. Its totient is φ = 132487600.

The previous prime is 135799801. The next prime is 135799841. The reversal of 135799831 is 138997531.

It is a happy number.

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 135799831 - 2¹³ = 135791639 is a prime.

It is a super-2 number, since 2×135799831² = 36883188199257122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135799801) 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, 1656055 + ... + 1656136.

It is an arithmetic number, because the mean of its divisors is an integer number (34778016).

Almost surely, 2^135799831 is an apocalyptic number.

135799831 is a deficient number, since it is larger than the sum of its proper divisors (3312233).

135799831 is an equidigital number, since it uses as much as digits as its factorization.

135799831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312232.

The product of its digits is 204120, while the sum is 46.

The square root of 135799831 is about 11653.3184544146. The cubic root of 135799831 is about 514.0038948061.

The spelling of 135799831 in words is "one hundred thirty-five million, seven hundred ninety-nine thousand, eight hundred thirty-one".