13115749 has 4 divisors (see below), whose sum is σ = 13127500. Its totient is φ = 13104000.

The previous prime is 13115747. The next prime is 13115783. The reversal of 13115749 is 94751131.

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 4601025 + 8514724 = 2145^2 + 2918^2 .

It is a cyclic number.

It is not a de Polignac number, because 13115749 - 2¹ = 13115747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13115749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13115747) 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, 4002 + ... + 6499.

It is an arithmetic number, because the mean of its divisors is an integer number (3281875).

Almost surely, 2^13115749 is an apocalyptic number.

It is an amenable number.

13115749 is a deficient number, since it is larger than the sum of its proper divisors (11751).

13115749 is a wasteful number, since it uses less digits than its factorization.

13115749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11750.

The product of its digits is 3780, while the sum is 31.

The square root of 13115749 is about 3621.5672021930. The cubic root of 13115749 is about 235.8292658160.

The spelling of 13115749 in words is "thirteen million, one hundred fifteen thousand, seven hundred forty-nine".