971395492009 has 2 divisors, whose sum is σ = 971395492010. Its totient is φ = 971395492008.

The previous prime is 971395491971. The next prime is 971395492021. The reversal of 971395492009 is 900294593179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 926652666384 + 44742825625 = 962628^2 + 211525^2 .

It is an emirp because it is prime and its reverse (900294593179) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 971395492009 - 2¹⁵ = 971395459241 is a prime.

It is not a weakly prime, because it can be changed into another prime (971395498009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485697746004 + 485697746005.

It is an arithmetic number, because the mean of its divisors is an integer number (485697746005).

Almost surely, 2^971395492009 is an apocalyptic number.

It is an amenable number.

971395492009 is a deficient number, since it is larger than the sum of its proper divisors (1).

971395492009 is an equidigital number, since it uses as much as digits as its factorization.

971395492009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5511240, while the sum is 58.

The spelling of 971395492009 in words is "nine hundred seventy-one billion, three hundred ninety-five million, four hundred ninety-two thousand, nine".