998151977 has 2 divisors, whose sum is σ = 998151978. Its totient is φ = 998151976.

The previous prime is 998151971. The next prime is 998152007. The reversal of 998151977 is 779151899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 874030096 + 124121881 = 29564^2 + 11141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998151977 is a prime.

It is not a weakly prime, because it can be changed into another prime (998151971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499075988 + 499075989.

It is an arithmetic number, because the mean of its divisors is an integer number (499075989).

Almost surely, 2^998151977 is an apocalyptic number.

It is an amenable number.

998151977 is a deficient number, since it is larger than the sum of its proper divisors (1).

998151977 is an equidigital number, since it uses as much as digits as its factorization.

998151977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 56.

The square root of 998151977 is about 31593.5432802337. The cubic root of 998151977 is about 999.3836124778.

The spelling of 998151977 in words is "nine hundred ninety-eight million, one hundred fifty-one thousand, nine hundred seventy-seven".