1222581 has 4 divisors (see below), whose sum is σ = 1630112. Its totient is φ = 815052.

The previous prime is 1222567. The next prime is 1222583. The reversal of 1222581 is 1852221.

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.

It is not a de Polignac number, because 1222581 - 2¹⁰ = 1221557 is a prime.

It is a super-2 number, since 2×1222581² = 2989408603122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222583) 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, 203761 + ... + 203766.

It is an arithmetic number, because the mean of its divisors is an integer number (407528).

2^1222581 is an apocalyptic number.

It is an amenable number.

1222581 is a deficient number, since it is larger than the sum of its proper divisors (407531).

1222581 is an equidigital number, since it uses as much as digits as its factorization.

1222581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407530.

The product of its digits is 320, while the sum is 21.

The square root of 1222581 is about 1105.7038482342. The cubic root of 1222581 is about 106.9282717222.

The spelling of 1222581 in words is "one million, two hundred twenty-two thousand, five hundred eighty-one".