2155055251 has 4 divisors (see below), whose sum is σ = 2155931272. Its totient is φ = 2154179232.

The previous prime is 2155055237. The next prime is 2155055263. The reversal of 2155055251 is 1525505512.

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

It is a cyclic number.

It is not a de Polignac number, because 2155055251 - 2¹¹ = 2155053203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155055051) 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, 434310 + ... + 439243.

It is an arithmetic number, because the mean of its divisors is an integer number (538982818).

Almost surely, 2^2155055251 is an apocalyptic number.

2155055251 is a deficient number, since it is larger than the sum of its proper divisors (876021).

2155055251 is an equidigital number, since it uses as much as digits as its factorization.

2155055251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876020.

The product of its (nonzero) digits is 12500, while the sum is 31.

The square root of 2155055251 is about 46422.5726452122. The cubic root of 2155055251 is about 1291.6736586196.

The spelling of 2155055251 in words is "two billion, one hundred fifty-five million, fifty-five thousand, two hundred fifty-one".