135223144631 has 4 divisors (see below), whose sum is σ = 135386655912. Its totient is φ = 135059633352.

The previous prime is 135223144607. The next prime is 135223144669. The reversal of 135223144631 is 136441322531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136441322531 = 64663 ⋅2110037.

It is a cyclic number.

It is not a de Polignac number, because 135223144631 - 2¹⁰ = 135223143607 is a prime.

It is a super-2 number, since 2×135223144631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135223144591 and 135223144600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135223144691) 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, 81754400 + ... + 81756053.

It is an arithmetic number, because the mean of its divisors is an integer number (33846663978).

Almost surely, 2^135223144631 is an apocalyptic number.

135223144631 is a deficient number, since it is larger than the sum of its proper divisors (163511281).

135223144631 is an equidigital number, since it uses as much as digits as its factorization.

135223144631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163511280.

The product of its digits is 51840, while the sum is 35.

The spelling of 135223144631 in words is "one hundred thirty-five billion, two hundred twenty-three million, one hundred forty-four thousand, six hundred thirty-one".