1011561611 has 8 divisors (see below), whose sum is σ = 1040151504. Its totient is φ = 983037600.

The previous prime is 1011561601. The next prime is 1011561631. The reversal of 1011561611 is 1161651101.

It is a happy number.

1011561611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1011561611 - 2⁶ = 1011561547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011561601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15536 + ... + 47586.

It is an arithmetic number, because the mean of its divisors is an integer number (130018938).

Almost surely, 2^1011561611 is an apocalyptic number.

1011561611 is a deficient number, since it is larger than the sum of its proper divisors (28589893).

1011561611 is an equidigital number, since it uses as much as digits as its factorization.

1011561611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32941.

The product of its (nonzero) digits is 180, while the sum is 23.

The square root of 1011561611 is about 31805.0563747339. The cubic root of 1011561611 is about 1003.8391126858.

The spelling of 1011561611 in words is "one billion, eleven million, five hundred sixty-one thousand, six hundred eleven".