1211013149 has 2 divisors, whose sum is σ = 1211013150. Its totient is φ = 1211013148.

The previous prime is 1211013131. The next prime is 1211013151. The reversal of 1211013149 is 9413101121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613552900 + 597460249 = 24770^2 + 24443^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211013149 - 2¹⁶ = 1210947613 is a prime.

Together with 1211013151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211013049) 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, 605506574 + 605506575.

It is an arithmetic number, because the mean of its divisors is an integer number (605506575).

Almost surely, 2^1211013149 is an apocalyptic number.

It is an amenable number.

1211013149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211013149 is an equidigital number, since it uses as much as digits as its factorization.

1211013149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1211013149 is about 34799.6142076317. The cubic root of 1211013149 is about 1065.8995680767.

The spelling of 1211013149 in words is "one billion, two hundred eleven million, thirteen thousand, one hundred forty-nine".