1211020117 has 2 divisors, whose sum is σ = 1211020118. Its totient is φ = 1211020116.

The previous prime is 1211020103. The next prime is 1211020121. The reversal of 1211020117 is 7110201121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628956241 + 582063876 = 25079^2 + 24126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211020117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211020117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211020717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605510058 + 605510059.

It is an arithmetic number, because the mean of its divisors is an integer number (605510059).

Almost surely, 2^1211020117 is an apocalyptic number.

It is an amenable number.

1211020117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211020117 is an equidigital number, since it uses as much as digits as its factorization.

1211020117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 16.

The square root of 1211020117 is about 34799.7143235401. The cubic root of 1211020117 is about 1065.9016124184.

Adding to 1211020117 its reverse (7110201121), we get a palindrome (8321221238).

The spelling of 1211020117 in words is "one billion, two hundred eleven million, twenty thousand, one hundred seventeen".