131223344634 has 48 divisors (see below), whose sum is σ = 292433818248. Its totient is φ = 42495912576.

The previous prime is 131223344633. The next prime is 131223344663. The reversal of 131223344634 is 436443322131.

It is a happy number.

131223344634 is a `hidden beast` number, since 1 + 3 + 12 + 2 + 3 + 3 + 4 + 4 + 634 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 130411265625 + 812079009 = 361125^2 + 28497^2 .

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 305364 + ... + 596400.

Almost surely, 2^131223344634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131223344634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146216909124).

131223344634 is an abundant number, since it is smaller than the sum of its proper divisors (161210473614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131223344634 is a wasteful number, since it uses less digits than its factorization.

131223344634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291759 (or 291756 counting only the distinct ones).

The product of its digits is 124416, while the sum is 36.

Adding to 131223344634 its reverse (436443322131), we get a palindrome (567666666765).

The spelling of 131223344634 in words is "one hundred thirty-one billion, two hundred twenty-three million, three hundred forty-four thousand, six hundred thirty-four".