131223344635 has 4 divisors (see below), whose sum is σ = 157468013568. Its totient is φ = 104978675704.

The previous prime is 131223344633. The next prime is 131223344663. The reversal of 131223344635 is 536443322131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 536443322131 = 661 ⋅811563271.

It is a cyclic number.

It is not a de Polignac number, because 131223344635 - 2¹ = 131223344633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131223344594 and 131223344603.

It is not an unprimeable number, because it can be changed into a prime (131223344633) 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, 13122334459 + ... + 13122334468.

It is an arithmetic number, because the mean of its divisors is an integer number (39367003392).

Almost surely, 2^131223344635 is an apocalyptic number.

131223344635 is a deficient number, since it is larger than the sum of its proper divisors (26244668933).

131223344635 is an equidigital number, since it uses as much as digits as its factorization.

131223344635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26244668932.

The product of its digits is 155520, while the sum is 37.

Adding to 131223344635 its reverse (536443322131), we get a palindrome (667666666766).

The spelling of 131223344635 in words is "one hundred thirty-one billion, two hundred twenty-three million, three hundred forty-four thousand, six hundred thirty-five".