131440436461 has 4 divisors (see below), whose sum is σ = 131444902300. Its totient is φ = 131435970624.

The previous prime is 131440436441. The next prime is 131440436527. The reversal of 131440436461 is 164634044131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 164634044131 = 41 ⋅4015464491.

It can be written as a sum of positive squares in 2 ways, for example, as 126669080836 + 4771355625 = 355906^2 + 69075^2 .

It is a cyclic number.

It is not a de Polignac number, because 131440436461 - 2¹⁹ = 131439912173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131440436461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131440436411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2188476 + ... + 2247733.

It is an arithmetic number, because the mean of its divisors is an integer number (32861225575).

Almost surely, 2^131440436461 is an apocalyptic number.

It is an amenable number.

131440436461 is a deficient number, since it is larger than the sum of its proper divisors (4465839).

131440436461 is an equidigital number, since it uses as much as digits as its factorization.

131440436461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4465838.

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 131440436461 in words is "one hundred thirty-one billion, four hundred forty million, four hundred thirty-six thousand, four hundred sixty-one".