2155322245 has 4 divisors (see below), whose sum is σ = 2586386700. Its totient is φ = 1724257792.

The previous prime is 2155322243. The next prime is 2155322251. The reversal of 2155322245 is 5422235512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 264290049 + 1891032196 = 16257^2 + 43486^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155322245 - 2¹ = 2155322243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155322243) 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, 215532220 + ... + 215532229.

It is an arithmetic number, because the mean of its divisors is an integer number (646596675).

Almost surely, 2^2155322245 is an apocalyptic number.

It is an amenable number.

2155322245 is a deficient number, since it is larger than the sum of its proper divisors (431064455).

2155322245 is an equidigital number, since it uses as much as digits as its factorization.

2155322245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431064454.

The product of its digits is 24000, while the sum is 31.

The square root of 2155322245 is about 46425.4482477014. The cubic root of 2155322245 is about 1291.7269990734.

Adding to 2155322245 its reverse (5422235512), we get a palindrome (7577557757).

The spelling of 2155322245 in words is "two billion, one hundred fifty-five million, three hundred twenty-two thousand, two hundred forty-five".