1145521 has 4 divisors (see below), whose sum is σ = 1233652. Its totient is φ = 1057392.

The previous prime is 1145509. The next prime is 1145533. The reversal of 1145521 is 1255411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1255411 = 53 ⋅23687.

It is an interprime number because it is at equal distance from previous prime (1145509) and next prime (1145533).

It can be written as a sum of positive squares in 2 ways, for example, as 640000 + 505521 = 800^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145521 - 2⁷ = 1145393 is a prime.

It is a super-2 number, since 2×1145521² = 2624436722882, which contains 22 as substring.

It is a Duffinian number.

1145521 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44046 + ... + 44071.

It is an arithmetic number, because the mean of its divisors is an integer number (308413).

2^1145521 is an apocalyptic number.

It is an amenable number.

1145521 is a deficient number, since it is larger than the sum of its proper divisors (88131).

1145521 is an equidigital number, since it uses as much as digits as its factorization.

1145521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88130.

The product of its digits is 200, while the sum is 19.

The square root of 1145521 is about 1070.2901475768. The cubic root of 1145521 is about 104.6327609129.

It can be divided in two parts, 11455 and 21, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 1145521 in words is "one million, one hundred forty-five thousand, five hundred twenty-one".