1121200991 has 2 divisors, whose sum is σ = 1121200992. Its totient is φ = 1121200990.

The previous prime is 1121200957. The next prime is 1121201023. The reversal of 1121200991 is 1990021211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1121200991 - 2¹⁴ = 1121184607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1121200991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121100991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560600495 + 560600496.

It is an arithmetic number, because the mean of its divisors is an integer number (560600496).

Almost surely, 2^1121200991 is an apocalyptic number.

1121200991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121200991 is an equidigital number, since it uses as much as digits as its factorization.

1121200991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 1121200991 is about 33484.3394887819. The cubic root of 1121200991 is about 1038.8698864999.

The spelling of 1121200991 in words is "one billion, one hundred twenty-one million, two hundred thousand, nine hundred ninety-one".