1361222257 has 2 divisors, whose sum is σ = 1361222258. Its totient is φ = 1361222256.

The previous prime is 1361222231. The next prime is 1361222279. The reversal of 1361222257 is 7522221631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1230325776 + 130896481 = 35076^2 + 11441^2 .

It is an emirp because it is prime and its reverse (7522221631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1361222257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1361226257) 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, 680611128 + 680611129.

It is an arithmetic number, because the mean of its divisors is an integer number (680611129).

Almost surely, 2^1361222257 is an apocalyptic number.

It is an amenable number.

1361222257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361222257 is an equidigital number, since it uses as much as digits as its factorization.

1361222257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 1361222257 is about 36894.7456557163. The cubic root of 1361222257 is about 1108.2634581509.

Adding to 1361222257 its reverse (7522221631), we get a palindrome (8883443888).

The spelling of 1361222257 in words is "one billion, three hundred sixty-one million, two hundred twenty-two thousand, two hundred fifty-seven".