998949881 has 2 divisors, whose sum is σ = 998949882. Its totient is φ = 998949880.

The previous prime is 998949821. The next prime is 998949911. The reversal of 998949881 is 188949899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 966277225 + 32672656 = 31085^2 + 5716^2 .

It is a cyclic number.

It is not a de Polignac number, because 998949881 - 2¹⁸ = 998687737 is a prime.

It is a super-2 number, since 2×998949881² = 1995801729499828322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (998949821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499474940 + 499474941.

It is an arithmetic number, because the mean of its divisors is an integer number (499474941).

Almost surely, 2^998949881 is an apocalyptic number.

It is an amenable number.

998949881 is a deficient number, since it is larger than the sum of its proper divisors (1).

998949881 is an equidigital number, since it uses as much as digits as its factorization.

998949881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 65.

The square root of 998949881 is about 31606.1684011207. The cubic root of 998949881 is about 999.6498377340.

The spelling of 998949881 in words is "nine hundred ninety-eight million, nine hundred forty-nine thousand, eight hundred eighty-one".