996401209 has 2 divisors, whose sum is σ = 996401210. Its totient is φ = 996401208.

The previous prime is 996401201. The next prime is 996401257. The reversal of 996401209 is 902104699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 996349225 + 51984 = 31565^2 + 228^2 .

It is a cyclic number.

It is not a de Polignac number, because 996401209 - 2³ = 996401201 is a prime.

It is equal to p_50673856 and since 996401209 and 50673856 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (996401201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498200604 + 498200605.

It is an arithmetic number, because the mean of its divisors is an integer number (498200605).

Almost surely, 2^996401209 is an apocalyptic number.

It is an amenable number.

996401209 is a deficient number, since it is larger than the sum of its proper divisors (1).

996401209 is an equidigital number, since it uses as much as digits as its factorization.

996401209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 996401209 is about 31565.8234329472. The cubic root of 996401209 is about 998.7989610830.

The spelling of 996401209 in words is "nine hundred ninety-six million, four hundred one thousand, two hundred nine".