2113729 has 4 divisors (see below), whose sum is σ = 2238084. Its totient is φ = 1989376.

The previous prime is 2113703. The next prime is 2113733. The reversal of 2113729 is 9273112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 859329 + 1254400 = 927^2 + 1120^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113729 - 2¹⁵ = 2080961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2113739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62152 + ... + 62185.

It is an arithmetic number, because the mean of its divisors is an integer number (559521).

2^2113729 is an apocalyptic number.

It is an amenable number.

2113729 is a deficient number, since it is larger than the sum of its proper divisors (124355).

2113729 is a wasteful number, since it uses less digits than its factorization.

2113729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124354.

The product of its digits is 756, while the sum is 25.

The square root of 2113729 is about 1453.8669127537. The cubic root of 2113729 is about 128.3363751832.

The spelling of 2113729 in words is "two million, one hundred thirteen thousand, seven hundred twenty-nine".