199612001 has 2 divisors, whose sum is σ = 199612002. Its totient is φ = 199612000.

The previous prime is 199611989. The next prime is 199612013. The reversal of 199612001 is 100216991.

It is a balanced prime because it is at equal distance from previous prime (199611989) and next prime (199612013).

It can be written as a sum of positive squares in only one way, i.e., 105987025 + 93624976 = 10295^2 + 9676^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199612001 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_11058680 and since 199612001 and 11058680 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 (199612051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99806000 + 99806001.

It is an arithmetic number, because the mean of its divisors is an integer number (99806001).

Almost surely, 2^199612001 is an apocalyptic number.

It is an amenable number.

199612001 is a deficient number, since it is larger than the sum of its proper divisors (1).

199612001 is an equidigital number, since it uses as much as digits as its factorization.

199612001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 199612001 is about 14128.4111279365. The cubic root of 199612001 is about 584.4251308419.

Adding to 199612001 its reverse (100216991), we get a palindrome (299828992).

The spelling of 199612001 in words is "one hundred ninety-nine million, six hundred twelve thousand, one".