13991611 has 4 divisors (see below), whose sum is σ = 14168800. Its totient is φ = 13814424.

The previous prime is 13991597. The next prime is 13991639. The reversal of 13991611 is 11619931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11619931 = 71 ⋅163661.

It is a cyclic number.

It is not a de Polignac number, because 13991611 - 2¹⁵ = 13958843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13991651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88476 + ... + 88633.

It is an arithmetic number, because the mean of its divisors is an integer number (3542200).

Almost surely, 2^13991611 is an apocalyptic number.

13991611 is a deficient number, since it is larger than the sum of its proper divisors (177189).

13991611 is an equidigital number, since it uses as much as digits as its factorization.

13991611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177188.

The product of its digits is 1458, while the sum is 31.

The square root of 13991611 is about 3740.5361915105. The cubic root of 13991611 is about 240.9660770765.

The spelling of 13991611 in words is "thirteen million, nine hundred ninety-one thousand, six hundred eleven".