1155521 has 4 divisors (see below), whose sum is σ = 1159344. Its totient is φ = 1151700.

The previous prime is 1155499. The next prime is 1155527. The reversal of 1155521 is 1255511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1255511 = 47 ⋅26713.

It is a cyclic number.

It is not a de Polignac number, because 1155521 - 2⁶ = 1155457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1155493 and 1155502.

It is not an unprimeable number, because it can be changed into a prime (1155527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1415 + ... + 2076.

It is an arithmetic number, because the mean of its divisors is an integer number (289836).

2^1155521 is an apocalyptic number.

It is an amenable number.

1155521 is a deficient number, since it is larger than the sum of its proper divisors (3823).

1155521 is an equidigital number, since it uses as much as digits as its factorization.

1155521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822.

The product of its digits is 250, while the sum is 20.

The square root of 1155521 is about 1074.9516268186. The cubic root of 1155521 is about 104.9363484211.

The spelling of 1155521 in words is "one million, one hundred fifty-five thousand, five hundred twenty-one".