2231161217 has 2 divisors, whose sum is σ = 2231161218. Its totient is φ = 2231161216.

The previous prime is 2231161201. The next prime is 2231161259. The reversal of 2231161217 is 7121611322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2156580721 + 74580496 = 46439^2 + 8636^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231161217 - 2⁴ = 2231161201 is a prime.

It is a super-3 number, since 3×2231161217³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2231161267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115580608 + 1115580609.

It is an arithmetic number, because the mean of its divisors is an integer number (1115580609).

Almost surely, 2^2231161217 is an apocalyptic number.

It is an amenable number.

2231161217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231161217 is an equidigital number, since it uses as much as digits as its factorization.

2231161217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 2231161217 is about 47235.1692809500. The cubic root of 2231161217 is about 1306.7032885390.

Adding to 2231161217 its reverse (7121611322), we get a palindrome (9352772539).

The spelling of 2231161217 in words is "two billion, two hundred thirty-one million, one hundred sixty-one thousand, two hundred seventeen".