998909969 has 2 divisors, whose sum is σ = 998909970. Its totient is φ = 998909968.

The previous prime is 998909929. The next prime is 998910041. The reversal of 998909969 is 969909899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 955613569 + 43296400 = 30913^2 + 6580^2 .

It is a cyclic number.

It is not a de Polignac number, because 998909969 - 2¹⁶ = 998844433 is a prime.

It is a super-2 number, since 2×998909969² = 1995642252335161922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 998909899 and 998909908.

It is not a weakly prime, because it can be changed into another prime (998909929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499454984 + 499454985.

It is an arithmetic number, because the mean of its divisors is an integer number (499454985).

Almost surely, 2^998909969 is an apocalyptic number.

It is an amenable number.

998909969 is a deficient number, since it is larger than the sum of its proper divisors (1).

998909969 is an equidigital number, since it uses as much as digits as its factorization.

998909969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25509168, while the sum is 68.

The square root of 998909969 is about 31605.5369990766. The cubic root of 998909969 is about 999.6365242347.

The spelling of 998909969 in words is "nine hundred ninety-eight million, nine hundred nine thousand, nine hundred sixty-nine".