135171621231 has 16 divisors (see below), whose sum is σ = 180941781504. Its totient is φ = 89758043424.

The previous prime is 135171621157. The next prime is 135171621289. The reversal of 135171621231 is 132126171531.

It is not a de Polignac number, because 135171621231 - 2¹³ = 135171613039 is a prime.

It is a super-2 number, since 2×135171621231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 135171621192 and 135171621201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135171621031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9869070 + ... + 9882756.

It is an arithmetic number, because the mean of its divisors is an integer number (11308861344).

Almost surely, 2^135171621231 is an apocalyptic number.

135171621231 is a deficient number, since it is larger than the sum of its proper divisors (45770160273).

135171621231 is a wasteful number, since it uses less digits than its factorization.

135171621231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26470.

The product of its digits is 7560, while the sum is 33.

Adding to 135171621231 its reverse (132126171531), we get a palindrome (267297792762).

The spelling of 135171621231 in words is "one hundred thirty-five billion, one hundred seventy-one million, six hundred twenty-one thousand, two hundred thirty-one".