131438637761 has 4 divisors (see below), whose sum is σ = 131689954992. Its totient is φ = 131187320532.

The previous prime is 131438637731. The next prime is 131438637769. The reversal of 131438637761 is 167736834131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131438637761 - 2⁶ = 131438637697 is a prime.

It is a super-2 number, since 2×131438637761² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131438637769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125657831 + ... + 125658876.

It is an arithmetic number, because the mean of its divisors is an integer number (32922488748).

Almost surely, 2^131438637761 is an apocalyptic number.

It is an amenable number.

131438637761 is a deficient number, since it is larger than the sum of its proper divisors (251317231).

131438637761 is an equidigital number, since it uses as much as digits as its factorization.

131438637761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251317230.

The product of its digits is 1524096, while the sum is 50.

The spelling of 131438637761 in words is "one hundred thirty-one billion, four hundred thirty-eight million, six hundred thirty-seven thousand, seven hundred sixty-one".