13775555 has 4 divisors (see below), whose sum is σ = 16530672. Its totient is φ = 11020440.

The previous prime is 13775539. The next prime is 13775599. The reversal of 13775555 is 55557731.

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 13775555 - 2⁴ = 13775539 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1377551 + ... + 1377560.

It is an arithmetic number, because the mean of its divisors is an integer number (4132668).

Almost surely, 2^13775555 is an apocalyptic number.

13775555 is a deficient number, since it is larger than the sum of its proper divisors (2755117).

13775555 is an equidigital number, since it uses as much as digits as its factorization.

13775555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2755116.

The product of its digits is 91875, while the sum is 38.

The square root of 13775555 is about 3711.5434794705. The cubic root of 13775555 is about 239.7193188608.

The spelling of 13775555 in words is "thirteen million, seven hundred seventy-five thousand, five hundred fifty-five".