1091025 has 36 divisors (see below), whose sum is σ = 2110108. Its totient is φ = 535680.
The previous prime is 1091023. The next prime is 1091033. The reversal of 1091025 is 5201901.
It can be written as a sum of positive squares in 6 ways, for example, as 104976 + 986049 = 324^2 + 993^2 .
It is not a de Polignac number, because 1091025 - 21 = 1091023 is a prime.
1091025 is a lucky number.
It is a junction number, because it is equal to n+sod(n) for n = 1090989 and 1091007.
It is not an unprimeable number, because it can be changed into a prime (1091021) by changing a digit.
It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2739 + ... + 3111.
21091025 is an apocalyptic number.
1091025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
It is an amenable number.
1091025 is a deficient number, since it is larger than the sum of its proper divisors (1019083).
1091025 is a wasteful number, since it uses less digits than its factorization.
1091025 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 402 (or 394 counting only the distinct ones).
The product of its (nonzero) digits is 90, while the sum is 18.
The square root of 1091025 is about 1044.5214215132. The cubic root of 1091025 is about 102.9464956035.
Adding to 1091025 its reverse (5201901), we get a palindrome (6292926).
The spelling of 1091025 in words is "one million, ninety-one thousand, twenty-five".
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