201215611117 has 2 divisors, whose sum is σ = 201215611118. Its totient is φ = 201215611116.

The previous prime is 201215611087. The next prime is 201215611147. The reversal of 201215611117 is 711116512102.

It is a balanced prime because it is at equal distance from previous prime (201215611087) and next prime (201215611147).

It can be written as a sum of positive squares in only one way, i.e., 182661357321 + 18554253796 = 427389^2 + 136214^2 .

It is a cyclic number.

It is not a de Polignac number, because 201215611117 - 2²³ = 201207222509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201215611147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100607805558 + 100607805559.

It is an arithmetic number, because the mean of its divisors is an integer number (100607805559).

Almost surely, 2^201215611117 is an apocalyptic number.

It is an amenable number.

201215611117 is a deficient number, since it is larger than the sum of its proper divisors (1).

201215611117 is an equidigital number, since it uses as much as digits as its factorization.

201215611117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 28.

The spelling of 201215611117 in words is "two hundred one billion, two hundred fifteen million, six hundred eleven thousand, one hundred seventeen".