1200010001 has 2 divisors, whose sum is σ = 1200010002. Its totient is φ = 1200010000.

The previous prime is 1200009997. The next prime is 1200010003. The reversal of 1200010001 is 1000100021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 790959376 + 409050625 = 28124^2 + 20225^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200010001 - 2² = 1200009997 is a prime.

Together with 1200010003, it forms a pair of twin primes.

It is a Chen prime.

1200010001 is a modest number, since divided by 10001 gives 12 as remainder.

It is not a weakly prime, because it can be changed into another prime (1200010003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600005000 + 600005001.

It is an arithmetic number, because the mean of its divisors is an integer number (600005001).

Almost surely, 2^1200010001 is an apocalyptic number.

It is an amenable number.

1200010001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200010001 is an equidigital number, since it uses as much as digits as its factorization.

1200010001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 1200010001 is about 34641.1605030778. The cubic root of 1200010001 is about 1062.6615212990.

Adding to 1200010001 its reverse (1000100021), we get a palindrome (2200110022).

It can be divided in two parts, 1 and 200010001, that added together give a palindrome (200010002).

The spelling of 1200010001 in words is "one billion, two hundred million, ten thousand, one".