998821441 has 2 divisors, whose sum is σ = 998821442. Its totient is φ = 998821440.

The previous prime is 998821433. The next prime is 998821463. The reversal of 998821441 is 144128899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 582498225 + 416323216 = 24135^2 + 20404^2 .

It is a cyclic number.

It is not a de Polignac number, because 998821441 - 2³ = 998821433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998821391 and 998821400.

It is not a weakly prime, because it can be changed into another prime (998831441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499410720 + 499410721.

It is an arithmetic number, because the mean of its divisors is an integer number (499410721).

Almost surely, 2^998821441 is an apocalyptic number.

It is an amenable number.

998821441 is a deficient number, since it is larger than the sum of its proper divisors (1).

998821441 is an equidigital number, since it uses as much as digits as its factorization.

998821441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 46.

The square root of 998821441 is about 31604.1364539517. The cubic root of 998821441 is about 999.6069925654.

The spelling of 998821441 in words is "nine hundred ninety-eight million, eight hundred twenty-one thousand, four hundred forty-one".