1150561561 has 2 divisors, whose sum is σ = 1150561562. Its totient is φ = 1150561560.

The previous prime is 1150561543. The next prime is 1150561567. The reversal of 1150561561 is 1651650511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1103501961 + 47059600 = 33219^2 + 6860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1150561561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1150561567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575280780 + 575280781.

It is an arithmetic number, because the mean of its divisors is an integer number (575280781).

Almost surely, 2^1150561561 is an apocalyptic number.

It is an amenable number.

1150561561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1150561561 is an equidigital number, since it uses as much as digits as its factorization.

1150561561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 31.

The square root of 1150561561 is about 33919.9286703259. The cubic root of 1150561561 is about 1047.8600592163.

The spelling of 1150561561 in words is "one billion, one hundred fifty million, five hundred sixty-one thousand, five hundred sixty-one".