1211286949 has 2 divisors, whose sum is σ = 1211286950. Its totient is φ = 1211286948.

The previous prime is 1211286919. The next prime is 1211286983. The reversal of 1211286949 is 9496821121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1195430625 + 15856324 = 34575^2 + 3982^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211286949 - 2¹⁵ = 1211254181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211286919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605643474 + 605643475.

It is an arithmetic number, because the mean of its divisors is an integer number (605643475).

Almost surely, 2^1211286949 is an apocalyptic number.

It is an amenable number.

1211286949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211286949 is an equidigital number, since it uses as much as digits as its factorization.

1211286949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 43.

The square root of 1211286949 is about 34803.5479369561. The cubic root of 1211286949 is about 1065.9798923656.

The spelling of 1211286949 in words is "one billion, two hundred eleven million, two hundred eighty-six thousand, nine hundred forty-nine".