135168861531 has 8 divisors (see below), whose sum is σ = 196609253184. Its totient is φ = 81920522120.

The previous prime is 135168861523. The next prime is 135168861547.

135168861531 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135168861531 - 2³ = 135168861523 is a prime.

It is a super-2 number, since 2×135168861531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135168861631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2048013021 + ... + 2048013086.

It is an arithmetic number, because the mean of its divisors is an integer number (24576156648).

Almost surely, 2^135168861531 is an apocalyptic number.

135168861531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

135168861531 is a deficient number, since it is larger than the sum of its proper divisors (61440391653).

135168861531 is a wasteful number, since it uses less digits than its factorization.

135168861531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4096026121.

The product of its digits is 518400, while the sum is 48.

It can be divided in two parts, 135168 and 861531, that added together give a palindrome (996699).

The spelling of 135168861531 in words is "one hundred thirty-five billion, one hundred sixty-eight million, eight hundred sixty-one thousand, five hundred thirty-one".