13121655 has 8 divisors (see below), whose sum is σ = 20994672. Its totient is φ = 6998208.

The previous prime is 13121639. The next prime is 13121657. The reversal of 13121655 is 55612131.

13121655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13121655 - 2⁴ = 13121639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437374 + ... + 437403.

It is an arithmetic number, because the mean of its divisors is an integer number (2624334).

Almost surely, 2^13121655 is an apocalyptic number.

13121655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13121655 is a deficient number, since it is larger than the sum of its proper divisors (7873017).

13121655 is an equidigital number, since it uses as much as digits as its factorization.

13121655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874785.

The product of its digits is 900, while the sum is 24.

The square root of 13121655 is about 3622.3825032705. The cubic root of 13121655 is about 235.8646583464.

Adding to 13121655 its reverse (55612131), we get a palindrome (68733786).

The spelling of 13121655 in words is "thirteen million, one hundred twenty-one thousand, six hundred fifty-five".