1091546 has 4 divisors (see below), whose sum is σ = 1637322. Its totient is φ = 545772.

The previous prime is 1091527. The next prime is 1091549. The reversal of 1091546 is 6451901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6451901 = 317 ⋅20353.

It can be written as a sum of positive squares in only one way, i.e., 801025 + 290521 = 895^2 + 539^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1091549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272885 + ... + 272888.

2^1091546 is an apocalyptic number.

1091546 is a deficient number, since it is larger than the sum of its proper divisors (545776).

1091546 is an equidigital number, since it uses as much as digits as its factorization.

1091546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545775.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1091546 is about 1044.7707882593. The cubic root of 1091546 is about 102.9628797649.

It can be divided in two parts, 1091 and 546, that multiplied together give a triangular number (595686 = T₁₀₉₁).

The spelling of 1091546 in words is "one million, ninety-one thousand, five hundred forty-six".