131440434525 has 72 divisors (see below), whose sum is σ = 239730192000. Its totient is φ = 68822595840.

The previous prime is 131440434491. The next prime is 131440434529. The reversal of 131440434525 is 525434044131.

131440434525 is a `hidden beast` number, since 131 + 4 + 40 + 434 + 52 + 5 = 666.

It is not a de Polignac number, because 131440434525 - 2⁸ = 131440434269 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131440434525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131440434529) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10733356 + ... + 10745594.

It is an arithmetic number, because the mean of its divisors is an integer number (3329586000).

Almost surely, 2^131440434525 is an apocalyptic number.

131440434525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131440434525 is a deficient number, since it is larger than the sum of its proper divisors (108289757475).

131440434525 is a wasteful number, since it uses less digits than its factorization.

131440434525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13123 (or 13115 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 131440434525 its reverse (525434044131), we get a palindrome (656874478656).

The spelling of 131440434525 in words is "one hundred thirty-one billion, four hundred forty million, four hundred thirty-four thousand, five hundred twenty-five".