1225509 has 8 divisors (see below), whose sum is σ = 1705152. Its totient is φ = 781440.

The previous prime is 1225507. The next prime is 1225517. The reversal of 1225509 is 9055221.

1225509 = 365² + 366² + ... + 373².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1225509 - 2¹ = 1225507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8812 + ... + 8949.

It is an arithmetic number, because the mean of its divisors is an integer number (213144).

2^1225509 is an apocalyptic number.

It is an amenable number.

1225509 is a deficient number, since it is larger than the sum of its proper divisors (479643).

1225509 is a wasteful number, since it uses less digits than its factorization.

1225509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17787.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1225509 is about 1107.0270999393. The cubic root of 1225509 is about 107.0135656950.

The spelling of 1225509 in words is "one million, two hundred twenty-five thousand, five hundred nine".