1101564 has 36 divisors (see below), whose sum is σ = 2863224. Its totient is φ = 356832.

The previous prime is 1101559. The next prime is 1101571. The reversal of 1101564 is 4651011.

1101564 is a `hidden beast` number, since 1 + 101 + 564 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 919 + ... + 1745.

It is an arithmetic number, because the mean of its divisors is an integer number (79534).

2^1101564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1101564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1431612).

1101564 is an abundant number, since it is smaller than the sum of its proper divisors (1761660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1101564 is a wasteful number, since it uses less digits than its factorization.

1101564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 869 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1101564 is about 1049.5541910735. The cubic root of 1101564 is about 103.2769121982.

Adding to 1101564 its reverse (4651011), we get a palindrome (5752575).

The spelling of 1101564 in words is "one million, one hundred one thousand, five hundred sixty-four".