1211549147 has 2 divisors, whose sum is σ = 1211549148. Its totient is φ = 1211549146.

The previous prime is 1211549113. The next prime is 1211549179. The reversal of 1211549147 is 7419451121.

It is a strong prime.

It is an emirp because it is prime and its reverse (7419451121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211549147 - 2⁶ = 1211549083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211549107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605774573 + 605774574.

It is an arithmetic number, because the mean of its divisors is an integer number (605774574).

Almost surely, 2^1211549147 is an apocalyptic number.

1211549147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211549147 is an equidigital number, since it uses as much as digits as its factorization.

1211549147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 35.

The square root of 1211549147 is about 34807.3145617412. The cubic root of 1211549147 is about 1066.0568016483.

The spelling of 1211549147 in words is "one billion, two hundred eleven million, five hundred forty-nine thousand, one hundred forty-seven".