1211783141 has 2 divisors, whose sum is σ = 1211783142. Its totient is φ = 1211783140.

The previous prime is 1211783119. The next prime is 1211783147. The reversal of 1211783141 is 1413871121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1084319041 + 127464100 = 32929^2 + 11290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211783141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211783147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605891570 + 605891571.

It is an arithmetic number, because the mean of its divisors is an integer number (605891571).

Almost surely, 2^1211783141 is an apocalyptic number.

It is an amenable number.

1211783141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211783141 is an equidigital number, since it uses as much as digits as its factorization.

1211783141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 29.

The square root of 1211783141 is about 34810.6756757176. The cubic root of 1211783141 is about 1066.1254286174.

The spelling of 1211783141 in words is "one billion, two hundred eleven million, seven hundred eighty-three thousand, one hundred forty-one".