131128860442 has 4 divisors (see below), whose sum is σ = 196693290666. Its totient is φ = 65564430220.

The previous prime is 131128860439. The next prime is 131128860461. The reversal of 131128860442 is 244068821131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244068821131 = 191161 ⋅1276771.

It can be written as a sum of positive squares in only one way, i.e., 89460211801 + 41668648641 = 299099^2 + 204129^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 131128860395 and 131128860404.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32782215109 + ... + 32782215112.

Almost surely, 2^131128860442 is an apocalyptic number.

131128860442 is a deficient number, since it is larger than the sum of its proper divisors (65564430224).

131128860442 is an equidigital number, since it uses as much as digits as its factorization.

131128860442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65564430223.

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 131128860442 in words is "one hundred thirty-one billion, one hundred twenty-eight million, eight hundred sixty thousand, four hundred forty-two".