899888981 has 2 divisors, whose sum is σ = 899888982. Its totient is φ = 899888980.

The previous prime is 899888971. The next prime is 899889013. The reversal of 899888981 is 189888998.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 830016100 + 69872881 = 28810^2 + 8359^2 .

It is a cyclic number.

It is not a de Polignac number, because 899888981 - 2⁶ = 899888917 is a prime.

It is a super-2 number, since 2×899888981² = 1619600356250436722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (899888971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449944490 + 449944491.

It is an arithmetic number, because the mean of its divisors is an integer number (449944491).

Almost surely, 2^899888981 is an apocalyptic number.

It is an amenable number.

899888981 is a deficient number, since it is larger than the sum of its proper divisors (1).

899888981 is an equidigital number, since it uses as much as digits as its factorization.

899888981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23887872, while the sum is 68.

The square root of 899888981 is about 29998.1496262686. The cubic root of 899888981 is about 965.4496838376.

It can be divided in two parts, 8998 and 88981, that added together give a palindrome (97979).

The spelling of 899888981 in words is "eight hundred ninety-nine million, eight hundred eighty-eight thousand, nine hundred eighty-one".