2220402161 has 2 divisors, whose sum is σ = 2220402162. Its totient is φ = 2220402160.

The previous prime is 2220402143. The next prime is 2220402179. The reversal of 2220402161 is 1612040222.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (2220402143) and next prime (2220402179).

It can be written as a sum of positive squares in only one way, i.e., 2201392561 + 19009600 = 46919^2 + 4360^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220402161 - 2⁶ = 2220402097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2220402131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110201080 + 1110201081.

It is an arithmetic number, because the mean of its divisors is an integer number (1110201081).

Almost surely, 2^2220402161 is an apocalyptic number.

It is an amenable number.

2220402161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220402161 is an equidigital number, since it uses as much as digits as its factorization.

2220402161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 2220402161 is about 47121.1434602345. The cubic root of 2220402161 is about 1304.5995181425.

Adding to 2220402161 its reverse (1612040222), we get a palindrome (3832442383).

The spelling of 2220402161 in words is "two billion, two hundred twenty million, four hundred two thousand, one hundred sixty-one".