9909157 has 4 divisors (see below), whose sum is σ = 9937900. Its totient is φ = 9880416.

The previous prime is 9909143. The next prime is 9909161. The reversal of 9909157 is 7519099.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8755681 + 1153476 = 2959^2 + 1074^2 .

It is a cyclic number.

It is not a de Polignac number, because 9909157 - 2¹¹ = 9907109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9909187) 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 in 3 ways as a sum of consecutive naturals, for example, 13848 + ... + 14545.

It is an arithmetic number, because the mean of its divisors is an integer number (2484475).

Almost surely, 2^9909157 is an apocalyptic number.

It is an amenable number.

9909157 is a deficient number, since it is larger than the sum of its proper divisors (28743).

9909157 is a wasteful number, since it uses less digits than its factorization.

9909157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28742.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 9909157 is about 3147.8813510042. The cubic root of 9909157 is about 214.7890991189.

The spelling of 9909157 in words is "nine million, nine hundred nine thousand, one hundred fifty-seven".