135117631 has 4 divisors (see below), whose sum is σ = 147401064. Its totient is φ = 122834200.

The previous prime is 135117629. The next prime is 135117637. The reversal of 135117631 is 136711531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136711531 = 11 ⋅12428321.

It is a cyclic number.

It is not a de Polignac number, because 135117631 - 2¹ = 135117629 is a prime.

It is a super-2 number, since 2×135117631² = 36513548414104322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135117631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135117637) 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, 6141700 + ... + 6141721.

It is an arithmetic number, because the mean of its divisors is an integer number (36850266).

Almost surely, 2^135117631 is an apocalyptic number.

135117631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

135117631 is a deficient number, since it is larger than the sum of its proper divisors (12283433).

135117631 is a wasteful number, since it uses less digits than its factorization.

135117631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12283432.

The product of its digits is 1890, while the sum is 28.

The square root of 135117631 is about 11624.0109686803. The cubic root of 135117631 is about 513.1417379190.

The spelling of 135117631 in words is "one hundred thirty-five million, one hundred seventeen thousand, six hundred thirty-one".