1091457 has 12 divisors (see below), whose sum is σ = 1587924. Its totient is φ = 722400.

The previous prime is 1091443. The next prime is 1091459. The reversal of 1091457 is 7541901.

It can be written as a sum of positive squares in 2 ways, for example, as 968256 + 123201 = 984^2 + 351^2 .

It is not a de Polignac number, because 1091457 - 2⁶ = 1091393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1091457.

It is not an unprimeable number, because it can be changed into a prime (1091459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1207 + ... + 1907.

It is an arithmetic number, because the mean of its divisors is an integer number (132327).

2^1091457 is an apocalyptic number.

It is an amenable number.

1091457 is a deficient number, since it is larger than the sum of its proper divisors (496467).

1091457 is a wasteful number, since it uses less digits than its factorization.

1091457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880 (or 877 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 1091457 is about 1044.7281943166. The cubic root of 1091457 is about 102.9600813043.

The spelling of 1091457 in words is "one million, ninety-one thousand, four hundred fifty-seven".