12691155 has 16 divisors (see below), whose sum is σ = 20509344. Its totient is φ = 6700800.

The previous prime is 12691109. The next prime is 12691169. The reversal of 12691155 is 55119621.

12691155 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12691155 - 2¹³ = 12682963 is a prime.

It is a super-2 number, since 2×12691155² = 322130830468050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2674 + ... + 5703.

It is an arithmetic number, because the mean of its divisors is an integer number (1281834).

Almost surely, 2^12691155 is an apocalyptic number.

12691155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12691155 is a deficient number, since it is larger than the sum of its proper divisors (7818189).

12691155 is a wasteful number, since it uses less digits than its factorization.

12691155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8486.

The product of its digits is 2700, while the sum is 30.

The square root of 12691155 is about 3562.4647366676. The cubic root of 12691155 is about 233.2564792241.

The spelling of 12691155 in words is "twelve million, six hundred ninety-one thousand, one hundred fifty-five".