131338777 has 4 divisors (see below), whose sum is σ = 131363856. Its totient is φ = 131313700.

The previous prime is 131338771. The next prime is 131338783. The reversal of 131338777 is 777833131.

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: 777833131 = 79 ⋅9845989.

It is an interprime number because it is at equal distance from previous prime (131338771) and next prime (131338783).

It is a cyclic number.

It is not a de Polignac number, because 131338777 - 2¹¹ = 131336729 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131338771) 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, 1363 + ... + 16264.

It is an arithmetic number, because the mean of its divisors is an integer number (32840964).

Almost surely, 2^131338777 is an apocalyptic number.

It is an amenable number.

131338777 is a deficient number, since it is larger than the sum of its proper divisors (25079).

131338777 is an equidigital number, since it uses as much as digits as its factorization.

131338777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25078.

The product of its digits is 74088, while the sum is 40.

The square root of 131338777 is about 11460.3131283574. The cubic root of 131338777 is about 508.3127336870.

The spelling of 131338777 in words is "one hundred thirty-one million, three hundred thirty-eight thousand, seven hundred seventy-seven".