163402609 has 2 divisors, whose sum is σ = 163402610. Its totient is φ = 163402608.

The previous prime is 163402607. The next prime is 163402639. The reversal of 163402609 is 906204361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153066384 + 10336225 = 12372^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 163402609 - 2¹ = 163402607 is a prime.

Together with 163402607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (163402607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81701304 + 81701305.

It is an arithmetic number, because the mean of its divisors is an integer number (81701305).

Almost surely, 2^163402609 is an apocalyptic number.

It is an amenable number.

163402609 is a deficient number, since it is larger than the sum of its proper divisors (1).

163402609 is an equidigital number, since it uses as much as digits as its factorization.

163402609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 163402609 is about 12782.9029957987. The cubic root of 163402609 is about 546.7049366344.

The spelling of 163402609 in words is "one hundred sixty-three million, four hundred two thousand, six hundred nine".