1215164161 has 2 divisors, whose sum is σ = 1215164162. Its totient is φ = 1215164160.

The previous prime is 1215164149. The next prime is 1215164173. The reversal of 1215164161 is 1614615121.

It is a balanced prime because it is at equal distance from previous prime (1215164149) and next prime (1215164173).

It can be written as a sum of positive squares in only one way, i.e., 695324161 + 519840000 = 26369^2 + 22800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215164161 - 2¹³ = 1215155969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215164261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607582080 + 607582081.

It is an arithmetic number, because the mean of its divisors is an integer number (607582081).

Almost surely, 2^1215164161 is an apocalyptic number.

It is an amenable number.

1215164161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215164161 is an equidigital number, since it uses as much as digits as its factorization.

1215164161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 28.

The square root of 1215164161 is about 34859.2048245510. The cubic root of 1215164161 is about 1067.1160470562.

Adding to 1215164161 its reverse (1614615121), we get a palindrome (2829779282).

The spelling of 1215164161 in words is "one billion, two hundred fifteen million, one hundred sixty-four thousand, one hundred sixty-one".