1212108817 has 2 divisors, whose sum is σ = 1212108818. Its totient is φ = 1212108816.

The previous prime is 1212108797. The next prime is 1212108827. The reversal of 1212108817 is 7188012121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 966215056 + 245893761 = 31084^2 + 15681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212108817 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212108827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606054408 + 606054409.

It is an arithmetic number, because the mean of its divisors is an integer number (606054409).

Almost surely, 2^1212108817 is an apocalyptic number.

It is an amenable number.

1212108817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212108817 is an equidigital number, since it uses as much as digits as its factorization.

1212108817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 31.

The square root of 1212108817 is about 34815.3531793087. The cubic root of 1212108817 is about 1066.2209298538.

The spelling of 1212108817 in words is "one billion, two hundred twelve million, one hundred eight thousand, eight hundred seventeen".