1211311471 has 2 divisors, whose sum is σ = 1211311472. Its totient is φ = 1211311470.

The previous prime is 1211311403. The next prime is 1211311501. The reversal of 1211311471 is 1741131121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211311471 - 2²³ = 1202922863 is a prime.

It is a super-3 number, since 3×1211311471³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211341471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605655735 + 605655736.

It is an arithmetic number, because the mean of its divisors is an integer number (605655736).

Almost surely, 2^1211311471 is an apocalyptic number.

1211311471 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211311471 is an equidigital number, since it uses as much as digits as its factorization.

1211311471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 22.

The square root of 1211311471 is about 34803.9002268424. The cubic root of 1211311471 is about 1065.9870857568.

Adding to 1211311471 its reverse (1741131121), we get a palindrome (2952442592).

The spelling of 1211311471 in words is "one billion, two hundred eleven million, three hundred eleven thousand, four hundred seventy-one".