9886157521 has 2 divisors, whose sum is σ = 9886157522. Its totient is φ = 9886157520.

The previous prime is 9886157483. The next prime is 9886157527. The reversal of 9886157521 is 1257516889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6684861121 + 3201296400 = 81761^2 + 56580^2 .

It is an emirp because it is prime and its reverse (1257516889) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9886157521 - 2¹¹ = 9886155473 is a prime.

It is a super-2 number, since 2×9886157521² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9886157527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4943078760 + 4943078761.

It is an arithmetic number, because the mean of its divisors is an integer number (4943078761).

Almost surely, 2^9886157521 is an apocalyptic number.

It is an amenable number.

9886157521 is a deficient number, since it is larger than the sum of its proper divisors (1).

9886157521 is an equidigital number, since it uses as much as digits as its factorization.

9886157521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 52.

The square root of 9886157521 is about 99429.1583037893. The cubic root of 9886157521 is about 2146.2279286607.

The spelling of 9886157521 in words is "nine billion, eight hundred eighty-six million, one hundred fifty-seven thousand, five hundred twenty-one".