2155205253 has 4 divisors (see below), whose sum is σ = 2873607008. Its totient is φ = 1436803500.

The previous prime is 2155205251. The next prime is 2155205263. The reversal of 2155205253 is 3525025512.

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 not a de Polignac number, because 2155205253 - 2¹ = 2155205251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155205253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155205251) 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, 359200873 + ... + 359200878.

It is an arithmetic number, because the mean of its divisors is an integer number (718401752).

Almost surely, 2^2155205253 is an apocalyptic number.

It is an amenable number.

2155205253 is a deficient number, since it is larger than the sum of its proper divisors (718401755).

2155205253 is an equidigital number, since it uses as much as digits as its factorization.

2155205253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718401754.

The product of its (nonzero) digits is 15000, while the sum is 30.

The square root of 2155205253 is about 46424.1882319982. The cubic root of 2155205253 is about 1291.7036267819.

The spelling of 2155205253 in words is "two billion, one hundred fifty-five million, two hundred five thousand, two hundred fifty-three".