1225551 has 16 divisors (see below), whose sum is σ = 1715168. Its totient is φ = 777600.

The previous prime is 1225541. The next prime is 1225559. The reversal of 1225551 is 1555221.

It is a de Polignac number, because none of the positive numbers 2^k-1225551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6681 + ... + 6861.

It is an arithmetic number, because the mean of its divisors is an integer number (107198).

2^1225551 is an apocalyptic number.

1225551 is a deficient number, since it is larger than the sum of its proper divisors (489617).

1225551 is a wasteful number, since it uses less digits than its factorization.

1225551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282.

The product of its digits is 500, while the sum is 21.

The square root of 1225551 is about 1107.0460695021. The cubic root of 1225551 is about 107.0147881852.

The spelling of 1225551 in words is "one million, two hundred twenty-five thousand, five hundred fifty-one".