9197497891 has 2 divisors, whose sum is σ = 9197497892. Its totient is φ = 9197497890.

The previous prime is 9197497819. The next prime is 9197497901. The reversal of 9197497891 is 1987947919.

Together with previous prime (9197497819) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9197497891 - 2¹¹ = 9197495843 is a prime.

It is not a weakly prime, because it can be changed into another prime (9197497391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4598748945 + 4598748946.

It is an arithmetic number, because the mean of its divisors is an integer number (4598748946).

Almost surely, 2^9197497891 is an apocalyptic number.

9197497891 is a deficient number, since it is larger than the sum of its proper divisors (1).

9197497891 is an equidigital number, since it uses as much as digits as its factorization.

9197497891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 64.

The square root of 9197497891 is about 95903.5864345020. The cubic root of 9197497891 is about 2095.1891301734.

The spelling of 9197497891 in words is "nine billion, one hundred ninety-seven million, four hundred ninety-seven thousand, eight hundred ninety-one".