1091573 has 6 divisors (see below), whose sum is σ = 1269846. Its totient is φ = 935592.

The previous prime is 1091561. The next prime is 1091581. The reversal of 1091573 is 3751901.

1091573 = 2² + 3² + ... + 148².

It can be written as a sum of positive squares in only one way, i.e., 1044484 + 47089 = 1022^2 + 217^2 .

It is not a de Polignac number, because 1091573 - 2⁶ = 1091509 is a prime.

It is a super-2 number, since 2×1091573² = 2383063228658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11090 + ... + 11187.

It is an arithmetic number, because the mean of its divisors is an integer number (211641).

2^1091573 is an apocalyptic number.

It is an amenable number.

1091573 is a deficient number, since it is larger than the sum of its proper divisors (178273).

1091573 is an equidigital number, since it uses as much as digits as its factorization.

1091573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22291 (or 22284 counting only the distinct ones).

The product of its (nonzero) digits is 945, while the sum is 26.

The square root of 1091573 is about 1044.7837096739. The cubic root of 1091573 is about 102.9637287060.

The spelling of 1091573 in words is "one million, ninety-one thousand, five hundred seventy-three".