131509343077 has 4 divisors (see below), whose sum is σ = 150296392096. Its totient is φ = 112722294060.

The previous prime is 131509343033. The next prime is 131509343081. The reversal of 131509343077 is 770343905131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 770343905131 = 523 ⋅1472932897.

It is a cyclic number.

It is not a de Polignac number, because 131509343077 - 2⁷ = 131509342949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131509340077) 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, 9393524499 + ... + 9393524512.

It is an arithmetic number, because the mean of its divisors is an integer number (37574098024).

Almost surely, 2^131509343077 is an apocalyptic number.

It is an amenable number.

131509343077 is a deficient number, since it is larger than the sum of its proper divisors (18787049019).

131509343077 is an equidigital number, since it uses as much as digits as its factorization.

131509343077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18787049018.

The product of its (nonzero) digits is 238140, while the sum is 43.

The spelling of 131509343077 in words is "one hundred thirty-one billion, five hundred nine million, three hundred forty-three thousand, seventy-seven".