1121615009 has 2 divisors, whose sum is σ = 1121615010. Its totient is φ = 1121615008.

The previous prime is 1121614993. The next prime is 1121615017. The reversal of 1121615009 is 9005161211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1095808609 + 25806400 = 33103^2 + 5080^2 .

It is an emirp because it is prime and its reverse (9005161211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1121615009 - 2⁴ = 1121614993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121615029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560807504 + 560807505.

It is an arithmetic number, because the mean of its divisors is an integer number (560807505).

Almost surely, 2^1121615009 is an apocalyptic number.

It is an amenable number.

1121615009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121615009 is an equidigital number, since it uses as much as digits as its factorization.

1121615009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 26.

The square root of 1121615009 is about 33490.5211813731. The cubic root of 1121615009 is about 1038.9977428212.

The spelling of 1121615009 in words is "one billion, one hundred twenty-one million, six hundred fifteen thousand, nine".