9997157 has 4 divisors (see below), whose sum is σ = 10431840. Its totient is φ = 9562476.

The previous prime is 9997133. The next prime is 9997177. The reversal of 9997157 is 7517999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7517999 = 223 ⋅33713.

It is a cyclic number.

It is not a de Polignac number, because 9997157 - 2⁶ = 9997093 is a prime.

It is a pancake number, because a pancake can be divided into 9997157 parts by 4471 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217307 + ... + 217352.

It is an arithmetic number, because the mean of its divisors is an integer number (2607960).

Almost surely, 2^9997157 is an apocalyptic number.

It is an amenable number.

9997157 is a deficient number, since it is larger than the sum of its proper divisors (434683).

9997157 is a wasteful number, since it uses less digits than its factorization.

9997157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434682.

The product of its digits is 178605, while the sum is 47.

The square root of 9997157 is about 3161.8281104450. The cubic root of 9997157 is about 215.4230502086.

The spelling of 9997157 in words is "nine million, nine hundred ninety-seven thousand, one hundred fifty-seven".