1211549113 has 2 divisors, whose sum is σ = 1211549114. Its totient is φ = 1211549112.

The previous prime is 1211549111. The next prime is 1211549147. The reversal of 1211549113 is 3119451121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1211248809 + 300304 = 34803^2 + 548^2 .

It is an emirp because it is prime and its reverse (3119451121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211549113 - 2¹ = 1211549111 is a prime.

It is a super-2 number, since 2×1211549113² = 2935702506422173538, which contains 22 as substring.

Together with 1211549111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1211549111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605774556 + 605774557.

It is an arithmetic number, because the mean of its divisors is an integer number (605774557).

Almost surely, 2^1211549113 is an apocalyptic number.

It is an amenable number.

1211549113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211549113 is an equidigital number, since it uses as much as digits as its factorization.

1211549113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 28.

The square root of 1211549113 is about 34807.3140733381. The cubic root of 1211549113 is about 1066.0567916760.

The spelling of 1211549113 in words is "one billion, two hundred eleven million, five hundred forty-nine thousand, one hundred thirteen".