12154489 has 2 divisors, whose sum is σ = 12154490. Its totient is φ = 12154488.

The previous prime is 12154487. The next prime is 12154501. The reversal of 12154489 is 98445121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10291264 + 1863225 = 3208^2 + 1365^2 .

It is a cyclic number.

It is not a de Polignac number, because 12154489 - 2¹ = 12154487 is a prime.

It is a super-2 number, since 2×12154489² = 295463205702242, which contains 22 as substring.

Together with 12154487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12154487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077244 + 6077245.

It is an arithmetic number, because the mean of its divisors is an integer number (6077245).

Almost surely, 2^12154489 is an apocalyptic number.

It is an amenable number.

12154489 is a deficient number, since it is larger than the sum of its proper divisors (1).

12154489 is an equidigital number, since it uses as much as digits as its factorization.

12154489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 12154489 is about 3486.3288714635. The cubic root of 12154489 is about 229.9211386850.

The spelling of 12154489 in words is "twelve million, one hundred fifty-four thousand, four hundred eighty-nine".