971868251 has 2 divisors, whose sum is σ = 971868252. Its totient is φ = 971868250.

The previous prime is 971868211. The next prime is 971868269. The reversal of 971868251 is 152868179.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 971868251 - 2⁶ = 971868187 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 971868196 and 971868205.

It is not a weakly prime, because it can be changed into another prime (971868211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485934125 + 485934126.

It is an arithmetic number, because the mean of its divisors is an integer number (485934126).

Almost surely, 2^971868251 is an apocalyptic number.

971868251 is a deficient number, since it is larger than the sum of its proper divisors (1).

971868251 is an equidigital number, since it uses as much as digits as its factorization.

971868251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 47.

The square root of 971868251 is about 31174.8015390636. The cubic root of 971868251 is about 990.5334169246.

The spelling of 971868251 in words is "nine hundred seventy-one million, eight hundred sixty-eight thousand, two hundred fifty-one".