1210001609 has 4 divisors (see below), whose sum is σ = 1210097616. Its totient is φ = 1209905604.

The previous prime is 1210001599. The next prime is 1210001623. The reversal of 1210001609 is 9061000121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1210001609 - 2⁴ = 1210001593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1210001629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25619 + ... + 55464.

It is an arithmetic number, because the mean of its divisors is an integer number (302524404).

Almost surely, 2^1210001609 is an apocalyptic number.

It is an amenable number.

1210001609 is a deficient number, since it is larger than the sum of its proper divisors (96007).

1210001609 is an equidigital number, since it uses as much as digits as its factorization.

1210001609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96006.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1210001609 is about 34785.0773895934. The cubic root of 1210001609 is about 1065.6027090953.

The spelling of 1210001609 in words is "one billion, two hundred ten million, one thousand, six hundred nine".