1150660561 has 4 divisors (see below), whose sum is σ = 1157550912. Its totient is φ = 1143770212.

The previous prime is 1150660547. The next prime is 1150660661. The reversal of 1150660561 is 1650660511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1650660511 = 19 ⋅86876869.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1150660561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1150660061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3444925 + ... + 3445258.

It is an arithmetic number, because the mean of its divisors is an integer number (289387728).

Almost surely, 2^1150660561 is an apocalyptic number.

It is an amenable number.

1150660561 is a deficient number, since it is larger than the sum of its proper divisors (6890351).

1150660561 is an equidigital number, since it uses as much as digits as its factorization.

1150660561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6890350.

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

The square root of 1150660561 is about 33921.3879580420. The cubic root of 1150660561 is about 1047.8901127061.

The spelling of 1150660561 in words is "one billion, one hundred fifty million, six hundred sixty thousand, five hundred sixty-one".