1211543 has 2 divisors, whose sum is σ = 1211544. Its totient is φ = 1211542.

The previous prime is 1211537. The next prime is 1211549. The reversal of 1211543 is 3451121.

It is a balanced prime because it is at equal distance from previous prime (1211537) and next prime (1211549).

It is a cyclic number.

It is not a de Polignac number, because 1211543 - 2¹² = 1207447 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605771 + 605772.

It is an arithmetic number, because the mean of its divisors is an integer number (605772).

2^1211543 is an apocalyptic number.

1211543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211543 is an equidigital number, since it uses as much as digits as its factorization.

1211543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 17.

The square root of 1211543 is about 1100.7011401829. The cubic root of 1211543 is about 106.6054998705.

Adding to 1211543 its reverse (3451121), we get a palindrome (4662664).

The spelling of 1211543 in words is "one million, two hundred eleven thousand, five hundred forty-three".