1081561 has 8 divisors (see below), whose sum is σ = 1172864. Its totient is φ = 991440.

The previous prime is 1081541. The next prime is 1081583. The reversal of 1081561 is 1651801.

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 1081561 - 2¹⁵ = 1048793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3370 + ... + 3676.

It is an arithmetic number, because the mean of its divisors is an integer number (146608).

2^1081561 is an apocalyptic number.

It is an amenable number.

1081561 is a deficient number, since it is larger than the sum of its proper divisors (91303).

1081561 is a wasteful number, since it uses less digits than its factorization.

1081561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1081561 is about 1039.9812498310. The cubic root of 1081561 is about 102.6479639757.

Adding to 1081561 its product of nonzero digits (240), we get a palindrome (1081801).

The spelling of 1081561 in words is "one million, eighty-one thousand, five hundred sixty-one".