1121210309 has 2 divisors, whose sum is σ = 1121210310. Its totient is φ = 1121210308.

The previous prime is 1121210287. The next prime is 1121210347. The reversal of 1121210309 is 9030121211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1070729284 + 50481025 = 32722^2 + 7105^2 .

It is an emirp because it is prime and its reverse (9030121211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1121210309 - 2⁸ = 1121210053 is a prime.

It is a super-2 number, since 2×1121210309² = 2514225114015750962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121210369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560605154 + 560605155.

It is an arithmetic number, because the mean of its divisors is an integer number (560605155).

Almost surely, 2^1121210309 is an apocalyptic number.

It is an amenable number.

1121210309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121210309 is an equidigital number, since it uses as much as digits as its factorization.

1121210309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1121210309 is about 33484.4786281644. The cubic root of 1121210309 is about 1038.8727644147.

The spelling of 1121210309 in words is "one billion, one hundred twenty-one million, two hundred ten thousand, three hundred nine".