13756991 has 4 divisors (see below), whose sum is σ = 14231400. Its totient is φ = 13282584.

The previous prime is 13756987. The next prime is 13757039. The reversal of 13756991 is 19965731.

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

It is a cyclic number.

It is not a de Polignac number, because 13756991 - 2² = 13756987 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 (13756091) 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, 237161 + ... + 237218.

It is an arithmetic number, because the mean of its divisors is an integer number (3557850).

Almost surely, 2^13756991 is an apocalyptic number.

13756991 is a deficient number, since it is larger than the sum of its proper divisors (474409).

13756991 is an equidigital number, since it uses as much as digits as its factorization.

13756991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474408.

The product of its digits is 51030, while the sum is 41.

The square root of 13756991 is about 3709.0417900045. The cubic root of 13756991 is about 239.6115881754.

The spelling of 13756991 in words is "thirteen million, seven hundred fifty-six thousand, nine hundred ninety-one".