13131779 has 4 divisors (see below), whose sum is σ = 13259376. Its totient is φ = 13004184.

The previous prime is 13131761. The next prime is 13131787. The reversal of 13131779 is 97713131.

13131779 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97713131 = 23 ⋅4248397.

It is a cyclic number.

It is not a de Polignac number, because 13131779 - 2⁸ = 13131523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13131719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63644 + ... + 63849.

It is an arithmetic number, because the mean of its divisors is an integer number (3314844).

Almost surely, 2^13131779 is an apocalyptic number.

13131779 is a deficient number, since it is larger than the sum of its proper divisors (127597).

13131779 is a wasteful number, since it uses less digits than its factorization.

13131779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127596.

The product of its digits is 3969, while the sum is 32.

The square root of 13131779 is about 3623.7796566568. The cubic root of 13131779 is about 235.9253031339.

The spelling of 13131779 in words is "thirteen million, one hundred thirty-one thousand, seven hundred seventy-nine".