2155515253 has 4 divisors (see below), whose sum is σ = 2213772460. Its totient is φ = 2097258048.

The previous prime is 2155515251. The next prime is 2155515317. The reversal of 2155515253 is 3525155512.

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 1454430769 + 701084484 = 38137^2 + 26478^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155515253 - 2¹ = 2155515251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155515251) 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, 29128548 + ... + 29128621.

It is an arithmetic number, because the mean of its divisors is an integer number (553443115).

Almost surely, 2^2155515253 is an apocalyptic number.

It is an amenable number.

2155515253 is a deficient number, since it is larger than the sum of its proper divisors (58257207).

2155515253 is an equidigital number, since it uses as much as digits as its factorization.

2155515253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58257206.

The product of its digits is 37500, while the sum is 34.

The square root of 2155515253 is about 46427.5268886896. The cubic root of 2155515253 is about 1291.7655557523.

The spelling of 2155515253 in words is "two billion, one hundred fifty-five million, five hundred fifteen thousand, two hundred fifty-three".