1091268 has 18 divisors (see below), whose sum is σ = 2758574. Its totient is φ = 363744.

The previous prime is 1091267. The next prime is 1091269. The reversal of 1091268 is 8621901.

It is an interprime number because it is at equal distance from previous prime (1091267) and next prime (1091269).

It can be written as a sum of positive squares in only one way, i.e., 1065024 + 26244 = 1032^2 + 162^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (1091261) 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, 15121 + ... + 15192.

2^1091268 is an apocalyptic number.

1091268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1091268 is an abundant number, since it is smaller than the sum of its proper divisors (1667306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091268 is a wasteful number, since it uses less digits than its factorization.

1091268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30323 (or 30318 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1091268 is about 1044.6377362512. The cubic root of 1091268 is about 102.9541380014.

The spelling of 1091268 in words is "one million, ninety-one thousand, two hundred sixty-eight".