1091493 has 24 divisors (see below), whose sum is σ = 1790880. Its totient is φ = 635040.

The previous prime is 1091477. The next prime is 1091509. The reversal of 1091493 is 3941901.

It is an interprime number because it is at equal distance from previous prime (1091477) and next prime (1091509).

It is not a de Polignac number, because 1091493 - 2⁴ = 1091477 is a prime.

It is a plaindrome in base 12.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1978 + ... + 2468.

It is an arithmetic number, because the mean of its divisors is an integer number (74620).

2^1091493 is an apocalyptic number.

1091493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1091493 is a deficient number, since it is larger than the sum of its proper divisors (699387).

1091493 is a wasteful number, since it uses less digits than its factorization.

1091493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 1091493 is about 1044.7454235363. The cubic root of 1091493 is about 102.9612132842.

The spelling of 1091493 in words is "one million, ninety-one thousand, four hundred ninety-three".