1121407909 has 2 divisors, whose sum is σ = 1121407910. Its totient is φ = 1121407908.

The previous prime is 1121407891. The next prime is 1121407939. The reversal of 1121407909 is 9097041211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1114090884 + 7317025 = 33378^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121407909 - 2²¹ = 1119310757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121407939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560703954 + 560703955.

It is an arithmetic number, because the mean of its divisors is an integer number (560703955).

Almost surely, 2^1121407909 is an apocalyptic number.

It is an amenable number.

1121407909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121407909 is an equidigital number, since it uses as much as digits as its factorization.

1121407909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 1121407909 is about 33487.4291189993. The cubic root of 1121407909 is about 1038.9337904917.

The spelling of 1121407909 in words is "one billion, one hundred twenty-one million, four hundred seven thousand, nine hundred nine".