133031431520 has 96 divisors (see below), whose sum is σ = 338724747648. Its totient is φ = 49081264128.

The previous prime is 133031431513. The next prime is 133031431523. The reversal of 133031431520 is 25134130331.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 133031431520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133031431523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2736062 + ... + 2784258.

It is an arithmetic number, because the mean of its divisors is an integer number (3528382788).

Almost surely, 2^133031431520 is an apocalyptic number.

133031431520 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 133031431520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169362373824).

133031431520 is an abundant number, since it is smaller than the sum of its proper divisors (205693316128).

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

133031431520 is a wasteful number, since it uses less digits than its factorization.

133031431520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49552 (or 49544 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 133031431520 its reverse (25134130331), we get a palindrome (158165561851).

The spelling of 133031431520 in words is "one hundred thirty-three billion, thirty-one million, four hundred thirty-one thousand, five hundred twenty".