2155205251 has 2 divisors, whose sum is σ = 2155205252. Its totient is φ = 2155205250.

The previous prime is 2155205249. The next prime is 2155205263. The reversal of 2155205251 is 1525025512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2155205251 - 2¹ = 2155205249 is a prime.

Together with 2155205249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2155205231) 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 as a sum of consecutive naturals, namely, 1077602625 + 1077602626.

It is an arithmetic number, because the mean of its divisors is an integer number (1077602626).

Almost surely, 2^2155205251 is an apocalyptic number.

2155205251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155205251 is an equidigital number, since it uses as much as digits as its factorization.

2155205251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 2155205251 is about 46424.1882104577. The cubic root of 2155205251 is about 1291.7036263824.

The spelling of 2155205251 in words is "two billion, one hundred fifty-five million, two hundred five thousand, two hundred fifty-one".