1150651561 has 4 divisors (see below), whose sum is σ = 1153465300. Its totient is φ = 1147837824.

The previous prime is 1150651553. The next prime is 1150651573. The reversal of 1150651561 is 1651560511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1651560511 = 211 ⋅7827301.

It can be written as a sum of positive squares in 2 ways, for example, as 1095610000 + 55041561 = 33100^2 + 7419^2 .

It is a cyclic number.

It is not a de Polignac number, because 1150651561 - 2³ = 1150651553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1150651261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1406256 + ... + 1407073.

It is an arithmetic number, because the mean of its divisors is an integer number (288366325).

Almost surely, 2^1150651561 is an apocalyptic number.

It is an amenable number.

1150651561 is a deficient number, since it is larger than the sum of its proper divisors (2813739).

1150651561 is an equidigital number, since it uses as much as digits as its factorization.

1150651561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813738.

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

The square root of 1150651561 is about 33921.2552981165. The cubic root of 1150651561 is about 1047.8873806419.

The spelling of 1150651561 in words is "one billion, one hundred fifty million, six hundred fifty-one thousand, five hundred sixty-one".