1115721477509 has 2 divisors, whose sum is σ = 1115721477510. Its totient is φ = 1115721477508.

The previous prime is 1115721477491. The next prime is 1115721477547. The reversal of 1115721477509 is 9057741275111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 933523116100 + 182198361409 = 966190^2 + 426847^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115721477509 - 2³⁶ = 1047002000773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1115721477709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557860738754 + 557860738755.

It is an arithmetic number, because the mean of its divisors is an integer number (557860738755).

Almost surely, 2^{1115721477509} is an apocalyptic number.

It is an amenable number.

1115721477509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115721477509 is an equidigital number, since it uses as much as digits as its factorization.

1115721477509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 617400, while the sum is 50.

The spelling of 1115721477509 in words is "one trillion, one hundred fifteen billion, seven hundred twenty-one million, four hundred seventy-seven thousand, five hundred nine".