612171220201 has 2 divisors, whose sum is σ = 612171220202. Its totient is φ = 612171220200.

The previous prime is 612171220169. The next prime is 612171220249. The reversal of 612171220201 is 102022171216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 580985426176 + 31185794025 = 762224^2 + 176595^2 .

It is a cyclic number.

It is not a de Polignac number, because 612171220201 - 2⁵ = 612171220169 is a prime.

It is not a weakly prime, because it can be changed into another prime (612171220261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306085610100 + 306085610101.

It is an arithmetic number, because the mean of its divisors is an integer number (306085610101).

Almost surely, 2^612171220201 is an apocalyptic number.

It is an amenable number.

612171220201 is a deficient number, since it is larger than the sum of its proper divisors (1).

612171220201 is an equidigital number, since it uses as much as digits as its factorization.

612171220201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 612171220201 its reverse (102022171216), we get a palindrome (714193391417).

The spelling of 612171220201 in words is "six hundred twelve billion, one hundred seventy-one million, two hundred twenty thousand, two hundred one".