1211520241 has 2 divisors, whose sum is σ = 1211520242. Its totient is φ = 1211520240.

The previous prime is 1211520187. The next prime is 1211520257. The reversal of 1211520241 is 1420251121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 839840400 + 371679841 = 28980^2 + 19279^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211520241 - 2¹¹ = 1211518193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211520841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605760120 + 605760121.

It is an arithmetic number, because the mean of its divisors is an integer number (605760121).

Almost surely, 2^1211520241 is an apocalyptic number.

It is an amenable number.

1211520241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211520241 is an equidigital number, since it uses as much as digits as its factorization.

1211520241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1211520241 is about 34806.8993304488. The cubic root of 1211520241 is about 1066.0483233341.

Adding to 1211520241 its reverse (1420251121), we get a palindrome (2631771362).

The spelling of 1211520241 in words is "one billion, two hundred eleven million, five hundred twenty thousand, two hundred forty-one".