1011045561 has 4 divisors (see below), whose sum is σ = 1348060752. Its totient is φ = 674030372.

The previous prime is 1011045559. The next prime is 1011045601. The reversal of 1011045561 is 1655401101.

1011045561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1011045561 - 2¹ = 1011045559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011049561) 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, 168507591 + ... + 168507596.

It is an arithmetic number, because the mean of its divisors is an integer number (337015188).

Almost surely, 2^1011045561 is an apocalyptic number.

It is an amenable number.

1011045561 is a deficient number, since it is larger than the sum of its proper divisors (337015191).

1011045561 is an equidigital number, since it uses as much as digits as its factorization.

1011045561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337015190.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 1011045561 is about 31796.9426360460. The cubic root of 1011045561 is about 1003.6683801982.

Adding to 1011045561 its reverse (1655401101), we get a palindrome (2666446662).

The spelling of 1011045561 in words is "one billion, eleven million, forty-five thousand, five hundred sixty-one".