135109631 has 4 divisors (see below), whose sum is σ = 137984352. Its totient is φ = 132234912.

The previous prime is 135109609. The next prime is 135109633. The reversal of 135109631 is 136901531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136901531 = 13 ⋅10530887.

It is a cyclic number.

It is not a de Polignac number, because 135109631 - 2¹⁸ = 134847487 is a prime.

It is a super-2 number, since 2×135109631² = 36509224777912322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135109594 and 135109603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135109633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1437290 + ... + 1437383.

It is an arithmetic number, because the mean of its divisors is an integer number (34496088).

Almost surely, 2^135109631 is an apocalyptic number.

135109631 is a deficient number, since it is larger than the sum of its proper divisors (2874721).

135109631 is an equidigital number, since it uses as much as digits as its factorization.

135109631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2874720.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 135109631 is about 11623.6668482885. Note that the first 3 decimals coincide. The cubic root of 135109631 is about 513.1316104103.

The spelling of 135109631 in words is "one hundred thirty-five million, one hundred nine thousand, six hundred thirty-one".