12801555 has 48 divisors (see below), whose sum is σ = 24286080. Its totient is φ = 6200064.

The previous prime is 12801541. The next prime is 12801559. The reversal of 12801555 is 55510821.

It is not a de Polignac number, because 12801555 - 2¹² = 12797459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12801559) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 46077 + ... + 46353.

It is an arithmetic number, because the mean of its divisors is an integer number (505960).

Almost surely, 2^12801555 is an apocalyptic number.

12801555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12801555 is a deficient number, since it is larger than the sum of its proper divisors (11484525).

12801555 is a wasteful number, since it uses less digits than its factorization.

12801555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 12801555 is about 3577.9260752564. The cubic root of 12801555 is about 233.9308912726.

The spelling of 12801555 in words is "twelve million, eight hundred one thousand, five hundred fifty-five".