135231555381 has 16 divisors (see below), whose sum is σ = 194214819456. Its totient is φ = 83203914816.

The previous prime is 135231555359. The next prime is 135231555401. The reversal of 135231555381 is 183555132531.

It is not a de Polignac number, because 135231555381 - 2¹¹ = 135231553333 is a prime.

It is a super-2 number, since 2×135231555381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135231555311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109185 + ... + 531398.

It is an arithmetic number, because the mean of its divisors is an integer number (12138426216).

Almost surely, 2^135231555381 is an apocalyptic number.

It is an amenable number.

135231555381 is a deficient number, since it is larger than the sum of its proper divisors (58983264075).

135231555381 is a wasteful number, since it uses less digits than its factorization.

135231555381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646012.

The product of its digits is 270000, while the sum is 42.

The spelling of 135231555381 in words is "one hundred thirty-five billion, two hundred thirty-one million, five hundred fifty-five thousand, three hundred eighty-one".