9391997 has 6 divisors (see below), whose sum is σ = 9487002. Its totient is φ = 9297632.

The previous prime is 9391979. The next prime is 9392003. The reversal of 9391997 is 7991939.

It is a happy number.

9391997 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 900601 + 8491396 = 949^2 + 2914^2 .

It is not a de Polignac number, because 9391997 - 2¹⁰ = 9390973 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9391927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40193 + ... + 40425.

It is an arithmetic number, because the mean of its divisors is an integer number (1581167).

Almost surely, 2^9391997 is an apocalyptic number.

It is an amenable number.

9391997 is a deficient number, since it is larger than the sum of its proper divisors (95005).

9391997 is an equidigital number, since it uses as much as digits as its factorization.

9391997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 406 counting only the distinct ones).

The product of its digits is 137781, while the sum is 47.

The square root of 9391997 is about 3064.6365200461. The cubic root of 9391997 is about 210.9855189481.

The spelling of 9391997 in words is "nine million, three hundred ninety-one thousand, nine hundred ninety-seven".