9971251 has 2 divisors, whose sum is σ = 9971252. Its totient is φ = 9971250.

The previous prime is 9971209. The next prime is 9971281. The reversal of 9971251 is 1521799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9971251 - 2⁷ = 9971123 is a prime.

It is not a weakly prime, because it can be changed into another prime (9971281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4985625 + 4985626.

It is an arithmetic number, because the mean of its divisors is an integer number (4985626).

Almost surely, 2^9971251 is an apocalyptic number.

9971251 is a deficient number, since it is larger than the sum of its proper divisors (1).

9971251 is an equidigital number, since it uses as much as digits as its factorization.

9971251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 34.

The square root of 9971251 is about 3157.7287723932. The cubic root of 9971251 is about 215.2368113601.

The spelling of 9971251 in words is "nine million, nine hundred seventy-one thousand, two hundred fifty-one".