9987157 has 2 divisors, whose sum is σ = 9987158. Its totient is φ = 9987156.

The previous prime is 9987121. The next prime is 9987181. The reversal of 9987157 is 7517899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9523396 + 463761 = 3086^2 + 681^2 .

It is an emirp because it is prime and its reverse (7517899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9987157 - 2¹¹ = 9985109 is a prime.

It is a super-3 number, since 3×9987157³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9987457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993578 + 4993579.

It is an arithmetic number, because the mean of its divisors is an integer number (4993579).

Almost surely, 2^9987157 is an apocalyptic number.

It is an amenable number.

9987157 is a deficient number, since it is larger than the sum of its proper divisors (1).

9987157 is an equidigital number, since it uses as much as digits as its factorization.

9987157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 46.

The square root of 9987157 is about 3160.2463511568. The cubic root of 9987157 is about 215.3511981417.

The spelling of 9987157 in words is "nine million, nine hundred eighty-seven thousand, one hundred fifty-seven".