1225581 has 16 divisors (see below), whose sum is σ = 1977984. Its totient is φ = 658944.

The previous prime is 1225579. The next prime is 1225589. The reversal of 1225581 is 1855221.

It is not a de Polignac number, because 1225581 - 2¹ = 1225579 is a prime.

It is a super-2 number, since 2×1225581² = 3004097575122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225589) 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, 1360 + ... + 2073.

It is an arithmetic number, because the mean of its divisors is an integer number (123624).

2^1225581 is an apocalyptic number.

It is an amenable number.

1225581 is a deficient number, since it is larger than the sum of its proper divisors (752403).

1225581 is a wasteful number, since it uses less digits than its factorization.

1225581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460.

The product of its digits is 800, while the sum is 24.

The square root of 1225581 is about 1107.0596189908. The cubic root of 1225581 is about 107.0156613754.

The spelling of 1225581 in words is "one million, two hundred twenty-five thousand, five hundred eighty-one".