1091761 has 4 divisors (see below), whose sum is σ = 1191024. Its totient is φ = 992500.

The previous prime is 1091749. The next prime is 1091777. The reversal of 1091761 is 1671901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1091761 - 2⁵ = 1091729 is a prime.

It is a super-2 number, since 2×1091761² = 2383884162242, which contains 22 as substring.

It is a Duffinian number.

1091761 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1091711) 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, 49615 + ... + 49636.

It is an arithmetic number, because the mean of its divisors is an integer number (297756).

2^1091761 is an apocalyptic number.

1091761 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1091761 is a deficient number, since it is larger than the sum of its proper divisors (99263).

1091761 is an equidigital number, since it uses as much as digits as its factorization.

1091761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99262.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 1091761 is about 1044.8736765753. The cubic root of 1091761 is about 102.9696394635.

The spelling of 1091761 in words is "one million, ninety-one thousand, seven hundred sixty-one".