1211032981 has 2 divisors, whose sum is σ = 1211032982. Its totient is φ = 1211032980.

The previous prime is 1211032919. The next prime is 1211032993. The reversal of 1211032981 is 1892301121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1147176900 + 63856081 = 33870^2 + 7991^2 .

It is an emirp because it is prime and its reverse (1892301121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211032981 - 2⁷ = 1211032853 is a prime.

It is a super-2 number, since 2×1211032981² = 2933201762139492722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211042981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605516490 + 605516491.

It is an arithmetic number, because the mean of its divisors is an integer number (605516491).

Almost surely, 2^1211032981 is an apocalyptic number.

It is an amenable number.

1211032981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211032981 is an equidigital number, since it uses as much as digits as its factorization.

1211032981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 1211032981 is about 34799.8991521527. The cubic root of 1211032981 is about 1065.9053865670.

The spelling of 1211032981 in words is "one billion, two hundred eleven million, thirty-two thousand, nine hundred eighty-one".