1231200001 has 2 divisors, whose sum is σ = 1231200002. Its totient is φ = 1231200000.

The previous prime is 1231199987. The next prime is 1231200007. The reversal of 1231200001 is 1000021321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1230325776 + 874225 = 35076^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231200001 - 2⁷ = 1231199873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231200007) 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 as a sum of consecutive naturals, namely, 615600000 + 615600001.

It is an arithmetic number, because the mean of its divisors is an integer number (615600001).

Almost surely, 2^1231200001 is an apocalyptic number.

It is an amenable number.

1231200001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231200001 is an equidigital number, since it uses as much as digits as its factorization.

1231200001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1231200001 is about 35088.4596555620. The cubic root of 1231200001 is about 1071.7895929150.

Adding to 1231200001 its reverse (1000021321), we get a palindrome (2231221322).

The spelling of 1231200001 in words is "one billion, two hundred thirty-one million, two hundred thousand, one".