998489077 has 2 divisors, whose sum is σ = 998489078. Its totient is φ = 998489076.

The previous prime is 998488927. The next prime is 998489099. The reversal of 998489077 is 770984899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 989039601 + 9449476 = 31449^2 + 3074^2 .

It is a cyclic number.

It is not a de Polignac number, because 998489077 - 2¹⁵ = 998456309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998484077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499244538 + 499244539.

It is an arithmetic number, because the mean of its divisors is an integer number (499244539).

Almost surely, 2^998489077 is an apocalyptic number.

It is an amenable number.

998489077 is a deficient number, since it is larger than the sum of its proper divisors (1).

998489077 is an equidigital number, since it uses as much as digits as its factorization.

998489077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9144576, while the sum is 61.

The square root of 998489077 is about 31598.8777807061. The cubic root of 998489077 is about 999.4961051326.

The spelling of 998489077 in words is "nine hundred ninety-eight million, four hundred eighty-nine thousand, seventy-seven".