1611212117 has 2 divisors, whose sum is σ = 1611212118. Its totient is φ = 1611212116.

The previous prime is 1611212089. The next prime is 1611212143. The reversal of 1611212117 is 7112121161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1374852241 + 236359876 = 37079^2 + 15374^2 .

It is an emirp because it is prime and its reverse (7112121161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1611212117 - 2¹⁰ = 1611211093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1611212092 and 1611212101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1611212147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805606058 + 805606059.

It is an arithmetic number, because the mean of its divisors is an integer number (805606059).

Almost surely, 2^1611212117 is an apocalyptic number.

It is an amenable number.

1611212117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611212117 is an equidigital number, since it uses as much as digits as its factorization.

1611212117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 23.

The square root of 1611212117 is about 40139.9067886312. The cubic root of 1611212117 is about 1172.3327741165.

Adding to 1611212117 its reverse (7112121161), we get a palindrome (8723333278).

The spelling of 1611212117 in words is "one billion, six hundred eleven million, two hundred twelve thousand, one hundred seventeen".