1222400161 has 2 divisors, whose sum is σ = 1222400162. Its totient is φ = 1222400160.

The previous prime is 1222400063. The next prime is 1222400171. The reversal of 1222400161 is 1610042221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1021185936 + 201214225 = 31956^2 + 14185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222400161 - 2¹¹ = 1222398113 is a prime.

It is a super-2 number, since 2×1222400161² = 2988524307225651842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1222400171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611200080 + 611200081.

It is an arithmetic number, because the mean of its divisors is an integer number (611200081).

Almost surely, 2^1222400161 is an apocalyptic number.

It is an amenable number.

1222400161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222400161 is an equidigital number, since it uses as much as digits as its factorization.

1222400161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1222400161 is about 34962.8397159041. The cubic root of 1222400161 is about 1069.2299933662.

Adding to 1222400161 its reverse (1610042221), we get a palindrome (2832442382).

The spelling of 1222400161 in words is "one billion, two hundred twenty-two million, four hundred thousand, one hundred sixty-one".