2251353209 has 4 divisors (see below), whose sum is σ = 2572975104. Its totient is φ = 1929731316.

The previous prime is 2251353199. The next prime is 2251353217. The reversal of 2251353209 is 9023531522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2251353209 - 2²⁰ = 2250304633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2251353289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160810937 + ... + 160810950.

It is an arithmetic number, because the mean of its divisors is an integer number (643243776).

Almost surely, 2^2251353209 is an apocalyptic number.

It is an amenable number.

2251353209 is a deficient number, since it is larger than the sum of its proper divisors (321621895).

2251353209 is an equidigital number, since it uses as much as digits as its factorization.

2251353209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321621894.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 2251353209 is about 47448.4268337740. The cubic root of 2251353209 is about 1310.6333415571.

The spelling of 2251353209 in words is "two billion, two hundred fifty-one million, three hundred fifty-three thousand, two hundred nine".