1211331151 has 2 divisors, whose sum is σ = 1211331152. Its totient is φ = 1211331150.

The previous prime is 1211331119. The next prime is 1211331161. The reversal of 1211331151 is 1511331121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211331151 - 2⁵ = 1211331119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211331161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605665575 + 605665576.

It is an arithmetic number, because the mean of its divisors is an integer number (605665576).

Almost surely, 2^1211331151 is an apocalyptic number.

1211331151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211331151 is an equidigital number, since it uses as much as digits as its factorization.

1211331151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90, while the sum is 19.

The square root of 1211331151 is about 34804.1829526280. The cubic root of 1211331151 is about 1065.9928587042.

Adding to 1211331151 its reverse (1511331121), we get a palindrome (2722662272).

It can be divided in two parts, 12113 and 31151, that added together give a square (43264 = 208²).

The spelling of 1211331151 in words is "one billion, two hundred eleven million, three hundred thirty-one thousand, one hundred fifty-one".