12191455 has 16 divisors (see below), whose sum is σ = 15331680. Its totient is φ = 9294208.

The previous prime is 12191441. The next prime is 12191461. The reversal of 12191455 is 55419121.

It is a cyclic number.

It is not a de Polignac number, because 12191455 - 2⁵ = 12191423 is a prime.

It is a congruent number.

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, 11529 + ... + 12541.

It is an arithmetic number, because the mean of its divisors is an integer number (958230).

Almost surely, 2^12191455 is an apocalyptic number.

12191455 is a deficient number, since it is larger than the sum of its proper divisors (3140225).

12191455 is a wasteful number, since it uses less digits than its factorization.

12191455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130.

The product of its digits is 1800, while the sum is 28.

The square root of 12191455 is about 3491.6264118602. The cubic root of 12191455 is about 230.1539926520.

The spelling of 12191455 in words is "twelve million, one hundred ninety-one thousand, four hundred fifty-five".