9887881 has 2 divisors, whose sum is σ = 9887882. Its totient is φ = 9887880.

The previous prime is 9887851. The next prime is 9887887. The reversal of 9887881 is 1887889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6943225 + 2944656 = 2635^2 + 1716^2 .

It is a cyclic number.

It is not a de Polignac number, because 9887881 - 2¹³ = 9879689 is a prime.

It is a super-2 number, since 2×9887881² = 195540381340322, which contains 22 as substring.

It is the 3145-th Hogben number.

It is not a weakly prime, because it can be changed into another prime (9887887) by changing a digit.

It is a nontrivial repunit in base 3144.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4943940 + 4943941.

It is an arithmetic number, because the mean of its divisors is an integer number (4943941).

Almost surely, 2^9887881 is an apocalyptic number.

It is an amenable number.

9887881 is a deficient number, since it is larger than the sum of its proper divisors (1).

9887881 is an equidigital number, since it uses as much as digits as its factorization.

9887881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 49.

The square root of 9887881 is about 3144.5001192558. The cubic root of 9887881 is about 214.6352640539.

The spelling of 9887881 in words is "nine million, eight hundred eighty-seven thousand, eight hundred eighty-one".