1225521 has 12 divisors (see below), whose sum is σ = 1931280. Its totient is φ = 742680.

The previous prime is 1225517. The next prime is 1225529. The reversal of 1225521 is 1255221.

It is not a de Polignac number, because 1225521 - 2² = 1225517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1225494 and 1225503.

It is not an unprimeable number, because it can be changed into a prime (1225529) 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, 6091 + ... + 6288.

It is an arithmetic number, because the mean of its divisors is an integer number (160940).

2^1225521 is an apocalyptic number.

1225521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1225521 is a deficient number, since it is larger than the sum of its proper divisors (705759).

1225521 is a wasteful number, since it uses less digits than its factorization.

1225521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12396 (or 12393 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 1225521 is about 1107.0325198475. The cubic root of 1225521 is about 107.0139149807.

It can be divided in two parts, 1 and 225521, that added together give a palindrome (225522).

The spelling of 1225521 in words is "one million, two hundred twenty-five thousand, five hundred twenty-one".