13172779 has 4 divisors (see below), whose sum is σ = 13421376. Its totient is φ = 12924184.

The previous prime is 13172729. The next prime is 13172791. The reversal of 13172779 is 97727131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13172779 - 2⁷ = 13172651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13172729) 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, 124219 + ... + 124324.

It is an arithmetic number, because the mean of its divisors is an integer number (3355344).

Almost surely, 2^13172779 is an apocalyptic number.

13172779 is a deficient number, since it is larger than the sum of its proper divisors (248597).

13172779 is an equidigital number, since it uses as much as digits as its factorization.

13172779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248596.

The product of its digits is 18522, while the sum is 37.

The square root of 13172779 is about 3629.4323247582. The cubic root of 13172779 is about 236.1705831252.

It can be divided in two parts, 1317 and 2779, that added together give a 12-th power (4096 = 2¹²).

The spelling of 13172779 in words is "thirteen million, one hundred seventy-two thousand, seven hundred seventy-nine".