11428251409 has 3 divisors (see below), whose sum is σ = 11428358313. Its totient is φ = 11428144506.

The previous prime is 11428251389. The next prime is 11428251413. The reversal of 11428251409 is 90415282411.

The square root of 11428251409 is 106903.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 11428251409 - 2⁷ = 11428251281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11428251449) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 53452 + ... + 160354.

It is an arithmetic number, because the mean of its divisors is an integer number (3809452771).

Almost surely, 2^11428251409 is an apocalyptic number.

11428251409 is the 106903-rd square number.

11428251409 is the 53452-nd centered octagonal number.

It is an amenable number.

11428251409 is a deficient number, since it is larger than the sum of its proper divisors (106904).

11428251409 is an frugal number, since it uses more digits than its factorization.

11428251409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213806 (or 106903 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 11428251409 in words is "eleven billion, four hundred twenty-eight million, two hundred fifty-one thousand, four hundred nine".