1128591 has 6 divisors (see below), whose sum is σ = 1630200. Its totient is φ = 752388.

The previous prime is 1128583. The next prime is 1128599. The reversal of 1128591 is 1958211.

It is an interprime number because it is at equal distance from previous prime (1128583) and next prime (1128599).

It is not a de Polignac number, because 1128591 - 2³ = 1128583 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128599) 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, 62691 + ... + 62708.

It is an arithmetic number, because the mean of its divisors is an integer number (271700).

2^1128591 is an apocalyptic number.

1128591 is a deficient number, since it is larger than the sum of its proper divisors (501609).

1128591 is a wasteful number, since it uses less digits than its factorization.

1128591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125405 (or 125402 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 1128591 is about 1062.3516367004. The cubic root of 1128591 is about 104.1147340776.

The spelling of 1128591 in words is "one million, one hundred twenty-eight thousand, five hundred ninety-one".