1211257417 has 2 divisors, whose sum is σ = 1211257418. Its totient is φ = 1211257416.

The previous prime is 1211257403. The next prime is 1211257457. The reversal of 1211257417 is 7147521121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 942428601 + 268828816 = 30699^2 + 16396^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211257417 - 2¹¹ = 1211255369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211257457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605628708 + 605628709.

It is an arithmetic number, because the mean of its divisors is an integer number (605628709).

Almost surely, 2^1211257417 is an apocalyptic number.

It is an amenable number.

1211257417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211257417 is an equidigital number, since it uses as much as digits as its factorization.

1211257417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3920, while the sum is 31.

The square root of 1211257417 is about 34803.1236672802. The cubic root of 1211257417 is about 1065.9712291902.

Adding to 1211257417 its reverse (7147521121), we get a palindrome (8358778538).

The spelling of 1211257417 in words is "one billion, two hundred eleven million, two hundred fifty-seven thousand, four hundred seventeen".