1150005561 has 4 divisors (see below), whose sum is σ = 1533340752. Its totient is φ = 766670372.

The previous prime is 1150005557. The next prime is 1150005569. The reversal of 1150005561 is 1655000511.

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.

It is a cyclic number.

It is not a de Polignac number, because 1150005561 - 2² = 1150005557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1150005569) 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, 191667591 + ... + 191667596.

It is an arithmetic number, because the mean of its divisors is an integer number (383335188).

Almost surely, 2^1150005561 is an apocalyptic number.

It is an amenable number.

1150005561 is a deficient number, since it is larger than the sum of its proper divisors (383335191).

1150005561 is an equidigital number, since it uses as much as digits as its factorization.

1150005561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383335190.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 1150005561 is about 33911.7319079990. The cubic root of 1150005561 is about 1047.6912419230.

The spelling of 1150005561 in words is "one billion, one hundred fifty million, five thousand, five hundred sixty-one".