1115561263 has 8 divisors (see below), whose sum is σ = 1132322400. Its totient is φ = 1098919008.

The previous prime is 1115561219. The next prime is 1115561281. The reversal of 1115561263 is 3621655111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1115561263 - 2⁹ = 1115560751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115561963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10723 + ... + 48436.

It is an arithmetic number, because the mean of its divisors is an integer number (141540300).

Almost surely, 2^1115561263 is an apocalyptic number.

1115561263 is a deficient number, since it is larger than the sum of its proper divisors (16761137).

1115561263 is a wasteful number, since it uses less digits than its factorization.

1115561263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59441.

The product of its digits is 5400, while the sum is 31.

The square root of 1115561263 is about 33400.0189071803. The cubic root of 1115561263 is about 1037.1250923534.

The spelling of 1115561263 in words is "one billion, one hundred fifteen million, five hundred sixty-one thousand, two hundred sixty-three".