13991055 has 32 divisors (see below), whose sum is σ = 24314304. Its totient is φ = 6829056.

The previous prime is 13991053. The next prime is 13991057. The reversal of 13991055 is 55019931.

It is an interprime number because it is at equal distance from previous prime (13991053) and next prime (13991057).

It is not a de Polignac number, because 13991055 - 2¹ = 13991053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13991053) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30387 + ... + 30843.

It is an arithmetic number, because the mean of its divisors is an integer number (759822).

Almost surely, 2^13991055 is an apocalyptic number.

13991055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13991055 is a deficient number, since it is larger than the sum of its proper divisors (10323249).

13991055 is a wasteful number, since it uses less digits than its factorization.

13991055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635.

The product of its (nonzero) digits is 6075, while the sum is 33.

The square root of 13991055 is about 3740.4618698765. The cubic root of 13991055 is about 240.9628851897.

The spelling of 13991055 in words is "thirteen million, nine hundred ninety-one thousand, fifty-five".