1091285 has 16 divisors (see below), whose sum is σ = 1432704. Its totient is φ = 793152.

The previous prime is 1091273. The next prime is 1091287. The reversal of 1091285 is 5821901.

1091285 = T₉₁ + T₉₂ + ... + T₁₉₃.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1091285 - 2⁴ = 1091269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6614 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (89544).

2^1091285 is an apocalyptic number.

It is an amenable number.

1091285 is a deficient number, since it is larger than the sum of its proper divisors (341419).

1091285 is a wasteful number, since it uses less digits than its factorization.

1091285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1091285 is about 1044.6458730115. The cubic root of 1091285 is about 102.9546726123.

The spelling of 1091285 in words is "one million, ninety-one thousand, two hundred eighty-five".