131779 has 2 divisors, whose sum is σ = 131780. Its totient is φ = 131778.

The previous prime is 131777. The next prime is 131783. The reversal of 131779 is 977131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131779 - 2¹ = 131777 is a prime.

Together with 131777, it forms a pair of twin primes.

131779 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (131771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65889 + 65890.

It is an arithmetic number, because the mean of its divisors is an integer number (65890).

2¹³¹⁷⁷⁹ is an apocalyptic number.

131779 is a deficient number, since it is larger than the sum of its proper divisors (1).

131779 is an equidigital number, since it uses as much as digits as its factorization.

131779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1323, while the sum is 28.

The square root of 131779 is about 363.0137738434. The cubic root of 131779 is about 50.8880023392. Note that the first 3 decimals are identical.

The spelling of 131779 in words is "one hundred thirty-one thousand, seven hundred seventy-nine".