1115152561 has 2 divisors, whose sum is σ = 1115152562. Its totient is φ = 1115152560.

The previous prime is 1115152547. The next prime is 1115152607. The reversal of 1115152561 is 1652515111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 587577600 + 527574961 = 24240^2 + 22969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1115152561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1115159561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557576280 + 557576281.

It is an arithmetic number, because the mean of its divisors is an integer number (557576281).

Almost surely, 2^1115152561 is an apocalyptic number.

It is an amenable number.

1115152561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115152561 is an equidigital number, since it uses as much as digits as its factorization.

1115152561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1500, while the sum is 28.

The square root of 1115152561 is about 33393.9000567469. The cubic root of 1115152561 is about 1036.9984216247.

Adding to 1115152561 its reverse (1652515111), we get a palindrome (2767667672).

The spelling of 1115152561 in words is "one billion, one hundred fifteen million, one hundred fifty-two thousand, five hundred sixty-one".