1091538 has 24 divisors (see below), whose sum is σ = 2703168. Its totient is φ = 311832.

The previous prime is 1091527. The next prime is 1091549. The reversal of 1091538 is 8351901.

It is an interprime number because it is at equal distance from previous prime (1091527) and next prime (1091549).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4206 + ... + 4457.

It is an arithmetic number, because the mean of its divisors is an integer number (112632).

2^1091538 is an apocalyptic number.

1091538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1091538 is an abundant number, since it is smaller than the sum of its proper divisors (1611630).

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

1091538 is a wasteful number, since it uses less digits than its factorization.

1091538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8678 (or 8675 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1091538 is about 1044.7669596613. The cubic root of 1091538 is about 102.9626282241.

The spelling of 1091538 in words is "one million, ninety-one thousand, five hundred thirty-eight".