12154897 has 4 divisors (see below), whose sum is σ = 12168756. Its totient is φ = 12141040.

The previous prime is 12154871. The next prime is 12154903. The reversal of 12154897 is 79845121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79845121 = 23 ⋅3471527.

It can be written as a sum of positive squares in 2 ways, for example, as 7096896 + 5058001 = 2664^2 + 2249^2 .

It is a cyclic number.

It is not a de Polignac number, because 12154897 - 2¹¹ = 12152849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12152897) 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 3 ways as a sum of consecutive naturals, for example, 5518 + ... + 7399.

It is an arithmetic number, because the mean of its divisors is an integer number (3042189).

Almost surely, 2^12154897 is an apocalyptic number.

It is an amenable number.

12154897 is a deficient number, since it is larger than the sum of its proper divisors (13859).

12154897 is an equidigital number, since it uses as much as digits as its factorization.

12154897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13858.

The product of its digits is 20160, while the sum is 37.

The square root of 12154897 is about 3486.3873852456. The cubic root of 12154897 is about 229.9237113086.

The spelling of 12154897 in words is "twelve million, one hundred fifty-four thousand, eight hundred ninety-seven".