131388773 has 4 divisors (see below), whose sum is σ = 131423808. Its totient is φ = 131353740.

The previous prime is 131388769. The next prime is 131388791. The reversal of 131388773 is 377883131.

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: 377883131 = 10303 ⋅36677.

It is a cyclic number.

It is not a de Polignac number, because 131388773 - 2² = 131388769 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 131388773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131388793) 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, 11111 + ... + 19652.

It is an arithmetic number, because the mean of its divisors is an integer number (32855952).

Almost surely, 2^131388773 is an apocalyptic number.

It is an amenable number.

131388773 is a deficient number, since it is larger than the sum of its proper divisors (35035).

131388773 is an equidigital number, since it uses as much as digits as its factorization.

131388773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35034.

The product of its digits is 84672, while the sum is 41.

The square root of 131388773 is about 11462.4941875667. The cubic root of 131388773 is about 508.3772243627.

The spelling of 131388773 in words is "one hundred thirty-one million, three hundred eighty-eight thousand, seven hundred seventy-three".