1091544 has 16 divisors (see below), whose sum is σ = 2728920. Its totient is φ = 363840.

The previous prime is 1091527. The next prime is 1091549. The reversal of 1091544 is 4451901.

1091544 = 5² + 6² + ... + 148².

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 45481 = 1091544 / (1 + 0 + 9 + 1 + 5 + 4 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091549) 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, 22717 + ... + 22764.

2^1091544 is an apocalyptic number.

It is an amenable number.

1091544 is an abundant number, since it is smaller than the sum of its proper divisors (1637376).

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

1091544 is a wasteful number, since it uses less digits than its factorization.

1091544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45490 (or 45486 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1091544 is about 1044.7698311111. The cubic root of 1091544 is about 102.9628168798.

It can be divided in two parts, 109 and 1544, that added together give a triangular number (1653 = T₅₇).

The spelling of 1091544 in words is "one million, ninety-one thousand, five hundred forty-four".