13749591 has 4 divisors (see below), whose sum is σ = 18332792. Its totient is φ = 9166392.

The previous prime is 13749581. The next prime is 13749599. The reversal of 13749591 is 19594731.

It is a happy number.

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

It is not a de Polignac number, because 13749591 - 2¹⁴ = 13733207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13749599) 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, 2291596 + ... + 2291601.

It is an arithmetic number, because the mean of its divisors is an integer number (4583198).

Almost surely, 2^13749591 is an apocalyptic number.

13749591 is a deficient number, since it is larger than the sum of its proper divisors (4583201).

13749591 is an equidigital number, since it uses as much as digits as its factorization.

13749591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4583200.

The product of its digits is 34020, while the sum is 39.

The square root of 13749591 is about 3708.0440935890. The cubic root of 13749591 is about 239.5686174469.

The spelling of 13749591 in words is "thirteen million, seven hundred forty-nine thousand, five hundred ninety-one".