2155023313 has 4 divisors (see below), whose sum is σ = 2158098228. Its totient is φ = 2151948400.

The previous prime is 2155023307. The next prime is 2155023317. The reversal of 2155023313 is 3133205512.

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 802475584 + 1352547729 = 28328^2 + 36777^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155023313 - 2⁹ = 2155022801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155023317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1536406 + ... + 1537807.

It is an arithmetic number, because the mean of its divisors is an integer number (539524557).

Almost surely, 2^2155023313 is an apocalyptic number.

It is an amenable number.

2155023313 is a deficient number, since it is larger than the sum of its proper divisors (3074915).

2155023313 is an equidigital number, since it uses as much as digits as its factorization.

2155023313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3074914.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 2155023313 is about 46422.2286518000. The cubic root of 2155023313 is about 1291.6672777040.

Adding to 2155023313 its reverse (3133205512), we get a palindrome (5288228825).

The spelling of 2155023313 in words is "two billion, one hundred fifty-five million, twenty-three thousand, three hundred thirteen".