13691949 has 4 divisors (see below), whose sum is σ = 18255936. Its totient is φ = 9127964.

The previous prime is 13691947. The next prime is 13691963. The reversal of 13691949 is 94919631.

13691949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13691949 - 2¹ = 13691947 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13691949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13691941) 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, 2281989 + ... + 2281994.

It is an arithmetic number, because the mean of its divisors is an integer number (4563984).

Almost surely, 2^13691949 is an apocalyptic number.

It is an amenable number.

13691949 is a deficient number, since it is larger than the sum of its proper divisors (4563987).

13691949 is an equidigital number, since it uses as much as digits as its factorization.

13691949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4563986.

The product of its digits is 52488, while the sum is 42.

The square root of 13691949 is about 3700.2633690050. The cubic root of 13691949 is about 239.2333697382.

The spelling of 13691949 in words is "thirteen million, six hundred ninety-one thousand, nine hundred forty-nine".