1011561 has 16 divisors (see below), whose sum is σ = 1420800. Its totient is φ = 639360.

The previous prime is 1011559. The next prime is 1011583. The reversal of 1011561 is 1651101.

It is not a de Polignac number, because 1011561 - 2¹ = 1011559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1011561.

It is not an unprimeable number, because it can be changed into a prime (1011961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6715 + ... + 6863.

It is an arithmetic number, because the mean of its divisors is an integer number (88800).

2^1011561 is an apocalyptic number.

It is an amenable number.

1011561 is a deficient number, since it is larger than the sum of its proper divisors (409239).

1011561 is a wasteful number, since it uses less digits than its factorization.

1011561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256.

The product of its (nonzero) digits is 30, while the sum is 15.

The square root of 1011561 is about 1005.7638887930. The cubic root of 1011561 is about 100.3838910574.

Adding to 1011561 its reverse (1651101), we get a palindrome (2662662).

The spelling of 1011561 in words is "one million, eleven thousand, five hundred sixty-one".