9121397 has 2 divisors, whose sum is σ = 9121398. Its totient is φ = 9121396.

The previous prime is 9121379. The next prime is 9121403. The reversal of 9121397 is 7931219.

It is a happy number.

Together with previous prime (9121379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7789681 + 1331716 = 2791^2 + 1154^2 .

It is a cyclic number.

It is not a de Polignac number, because 9121397 - 2²⁰ = 8072821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9121327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4560698 + 4560699.

It is an arithmetic number, because the mean of its divisors is an integer number (4560699).

Almost surely, 2^9121397 is an apocalyptic number.

It is an amenable number.

9121397 is a deficient number, since it is larger than the sum of its proper divisors (1).

9121397 is an equidigital number, since it uses as much as digits as its factorization.

9121397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 32.

The square root of 9121397 is about 3020.1650617143. The cubic root of 9121397 is about 208.9394527114.

The spelling of 9121397 in words is "nine million, one hundred twenty-one thousand, three hundred ninety-seven".