131605607077 has 4 divisors (see below), whose sum is σ = 150406408096. Its totient is φ = 112804806060.

The previous prime is 131605607071. The next prime is 131605607087. The reversal of 131605607077 is 770706506131.

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: 770706506131 = 599 ⋅1286655269.

It is a cyclic number.

It is not a de Polignac number, because 131605607077 - 2⁷ = 131605606949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131605607071) 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, 9400400499 + ... + 9400400512.

It is an arithmetic number, because the mean of its divisors is an integer number (37601602024).

Almost surely, 2^131605607077 is an apocalyptic number.

It is an amenable number.

131605607077 is a deficient number, since it is larger than the sum of its proper divisors (18800801019).

131605607077 is an equidigital number, since it uses as much as digits as its factorization.

131605607077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18800801018.

The product of its (nonzero) digits is 185220, while the sum is 43.

The spelling of 131605607077 in words is "one hundred thirty-one billion, six hundred five million, six hundred seven thousand, seventy-seven".