131311435420 has 96 divisors (see below), whose sum is σ = 316913990400. Its totient is φ = 45199526400.

The previous prime is 131311435397. The next prime is 131311435429. The reversal of 131311435420 is 24534113131.

It is a super-3 number, since 3×131311435420³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131311435429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5375835 + ... + 5400205.

It is an arithmetic number, because the mean of its divisors is an integer number (3301187400).

Almost surely, 2^131311435420 is an apocalyptic number.

131311435420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131311435420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158456995200).

131311435420 is an abundant number, since it is smaller than the sum of its proper divisors (185602554980).

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

131311435420 is a wasteful number, since it uses less digits than its factorization.

131311435420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25699 (or 25697 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 131311435420 its reverse (24534113131), we get a palindrome (155845548551).

The spelling of 131311435420 in words is "one hundred thirty-one billion, three hundred eleven million, four hundred thirty-five thousand, four hundred twenty".