131435025643 has 4 divisors (see below), whose sum is σ = 131476530240. Its totient is φ = 131393521048.

The previous prime is 131435025563. The next prime is 131435025671. The reversal of 131435025643 is 346520534131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346520534131 = 19 ⋅18237922849.

It is a cyclic number.

It is not a de Polignac number, because 131435025643 - 2²¹ = 131432928491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131435035643) 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, 20747548 + ... + 20753881.

It is an arithmetic number, because the mean of its divisors is an integer number (32869132560).

Almost surely, 2^131435025643 is an apocalyptic number.

131435025643 is a deficient number, since it is larger than the sum of its proper divisors (41504597).

131435025643 is an equidigital number, since it uses as much as digits as its factorization.

131435025643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41504596.

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 131435025643 its reverse (346520534131), we get a palindrome (477955559774).

The spelling of 131435025643 in words is "one hundred thirty-one billion, four hundred thirty-five million, twenty-five thousand, six hundred forty-three".