1222531 has 4 divisors (see below), whose sum is σ = 1239352. Its totient is φ = 1205712.

The previous prime is 1222523. The next prime is 1222537. The reversal of 1222531 is 1352221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1222531 - 2³ = 1222523 is a prime.

It is a super-2 number, since 2×1222531² = 2989164091922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222537) 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, 8301 + ... + 8446.

It is an arithmetic number, because the mean of its divisors is an integer number (309838).

2^1222531 is an apocalyptic number.

1222531 is a deficient number, since it is larger than the sum of its proper divisors (16821).

1222531 is an equidigital number, since it uses as much as digits as its factorization.

1222531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16820.

The product of its digits is 120, while the sum is 16.

The square root of 1222531 is about 1105.6812379705. The cubic root of 1222531 is about 106.9268140174.

Adding to 1222531 its reverse (1352221), we get a palindrome (2574752).

The spelling of 1222531 in words is "one million, two hundred twenty-two thousand, five hundred thirty-one".