131601400531561 has 8 divisors (see below), whose sum is σ = 131687549299080. Its totient is φ = 131515274618112.

The previous prime is 131601400531499. The next prime is 131601400531577. The reversal of 131601400531561 is 165135004106131.

It can be written as a sum of positive squares in 4 ways, for example, as 1902898855936 + 129698501675625 = 1379456^2 + 11388525^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131601400531561 - 2¹⁷ = 131601400400489 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 131601400531561.

It is not an unprimeable number, because it can be changed into a prime (131601400531061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5814531 + ... + 17234023.

It is an arithmetic number, because the mean of its divisors is an integer number (16460943662385).

Almost surely, 2^{131601400531561} is an apocalyptic number.

It is an amenable number.

131601400531561 is a deficient number, since it is larger than the sum of its proper divisors (86148767519).

131601400531561 is a wasteful number, since it uses less digits than its factorization.

131601400531561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11427035.

The product of its (nonzero) digits is 32400, while the sum is 37.

Adding to 131601400531561 its reverse (165135004106131), we get a palindrome (296736404637692).

The spelling of 131601400531561 in words is "one hundred thirty-one trillion, six hundred one billion, four hundred million, five hundred thirty-one thousand, five hundred sixty-one".