135799531 has 16 divisors (see below), whose sum is σ = 159040000. Its totient is φ = 115905384.

The previous prime is 135799523. The next prime is 135799577. The reversal of 135799531 is 135997531.

It is not a de Polignac number, because 135799531 - 2³ = 135799523 is a prime.

It is a super-2 number, since 2×135799531² = 36883025239639922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135799501) 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 15 ways as a sum of consecutive naturals, for example, 96370 + ... + 97768.

It is an arithmetic number, because the mean of its divisors is an integer number (9940000).

Almost surely, 2^135799531 is an apocalyptic number.

135799531 is a deficient number, since it is larger than the sum of its proper divisors (23240469).

135799531 is an equidigital number, since it uses as much as digits as its factorization.

135799531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703 (or 1689 counting only the distinct ones).

The product of its digits is 127575, while the sum is 43.

The square root of 135799531 is about 11653.3055825375. The cubic root of 135799531 is about 514.0035163047.

The spelling of 135799531 in words is "one hundred thirty-five million, seven hundred ninety-nine thousand, five hundred thirty-one".