1211144477 has 2 divisors, whose sum is σ = 1211144478. Its totient is φ = 1211144476.

The previous prime is 1211144471. The next prime is 1211144479. The reversal of 1211144477 is 7744411121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1152330916 + 58813561 = 33946^2 + 7669^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211144477 - 2¹⁶ = 1211078941 is a prime.

Together with 1211144479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211144471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605572238 + 605572239.

It is an arithmetic number, because the mean of its divisors is an integer number (605572239).

Almost surely, 2^1211144477 is an apocalyptic number.

It is an amenable number.

1211144477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211144477 is an equidigital number, since it uses as much as digits as its factorization.

1211144477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 32.

The square root of 1211144477 is about 34801.5010739479. The cubic root of 1211144477 is about 1065.9380970827.

Adding to 1211144477 its reverse (7744411121), we get a palindrome (8955555598).

The spelling of 1211144477 in words is "one billion, two hundred eleven million, one hundred forty-four thousand, four hundred seventy-seven".