12154401009 has 9 divisors (see below), whose sum is σ = 17556834763. Its totient is φ = 8102713512.

The previous prime is 12154401001. The next prime is 12154401067. The reversal of 12154401009 is 90010445121.

The square root of 12154401009 is 110247.

It is a perfect power (a square), and thus also a powerful number.

12154401009 is a `hidden beast` number, since 1 + 215 + 440 + 1 + 0 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1417296609 + 10737104400 = 37647^2 + 103620^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 12154401009 - 2³ = 12154401001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12154401001) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 312367 + ... + 349115.

Almost surely, 2^12154401009 is an apocalyptic number.

12154401009 is the 110247-th square number.

12154401009 is the 55124-th centered octagonal number.

It is an amenable number.

12154401009 is a deficient number, since it is larger than the sum of its proper divisors (5402433754).

12154401009 is an frugal number, since it uses more digits than its factorization.

12154401009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73504 (or 36752 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 12154401009 in words is "twelve billion, one hundred fifty-four million, four hundred one thousand, nine".