131783254637761 has 4 divisors (see below), whose sum is σ = 131792456750724. Its totient is φ = 131774052524800.

The previous prime is 131783254637729. The next prime is 131783254637777. The reversal of 131783254637761 is 167736452387131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4229270397361 + 127553984240400 = 2056519^2 + 11293980^2 .

It is a cyclic number.

It is not a de Polignac number, because 131783254637761 - 2⁵ = 131783254637729 is a prime.

It is a super-2 number, since 2×131783254637761² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131783254637693 and 131783254637702.

It is not an unprimeable number, because it can be changed into a prime (131783254635761) 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, 4601035000 + ... + 4601063641.

It is an arithmetic number, because the mean of its divisors is an integer number (32948114187681).

Almost surely, 2^{131783254637761} is an apocalyptic number.

It is an amenable number.

131783254637761 is a deficient number, since it is larger than the sum of its proper divisors (9202112963).

131783254637761 is an equidigital number, since it uses as much as digits as its factorization.

131783254637761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9202112962.

The product of its digits is 106686720, while the sum is 64.

The spelling of 131783254637761 in words is "one hundred thirty-one trillion, seven hundred eighty-three billion, two hundred fifty-four million, six hundred thirty-seven thousand, seven hundred sixty-one".