612112121 has 2 divisors, whose sum is σ = 612112122. Its totient is φ = 612112120.

The previous prime is 612112103. The next prime is 612112129. The reversal of 612112121 is 121211216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612067600 + 44521 = 24740^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 612112121 - 2⁶ = 612112057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 612112121.

It is not a weakly prime, because it can be changed into another prime (612112129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306056060 + 306056061.

It is an arithmetic number, because the mean of its divisors is an integer number (306056061).

Almost surely, 2^612112121 is an apocalyptic number.

It is an amenable number.

612112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

612112121 is an equidigital number, since it uses as much as digits as its factorization.

612112121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 17.

The square root of 612112121 is about 24740.8997613264. The cubic root of 612112121 is about 849.0703196421.

Adding to 612112121 its reverse (121211216), we get a palindrome (733323337).

The spelling of 612112121 in words is "six hundred twelve million, one hundred twelve thousand, one hundred twenty-one".