2151566171 has 2 divisors, whose sum is σ = 2151566172. Its totient is φ = 2151566170.

The previous prime is 2151566159. The next prime is 2151566239. The reversal of 2151566171 is 1716651512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2151566171 - 2⁶ = 2151566107 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2151566101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075783085 + 1075783086.

It is an arithmetic number, because the mean of its divisors is an integer number (1075783086).

Almost surely, 2^2151566171 is an apocalyptic number.

2151566171 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151566171 is an equidigital number, since it uses as much as digits as its factorization.

2151566171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 35.

The square root of 2151566171 is about 46384.9778592164. The cubic root of 2151566171 is about 1290.9761997659.

The spelling of 2151566171 in words is "two billion, one hundred fifty-one million, five hundred sixty-six thousand, one hundred seventy-one".