1223531 has 4 divisors (see below), whose sum is σ = 1276752. Its totient is φ = 1170312.

The previous prime is 1223527. The next prime is 1223533. The reversal of 1223531 is 1353221.

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 1223531 - 2² = 1223527 is a prime.

It is a super-2 number, since 2×1223531² = 2994056215922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223533) 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, 26576 + ... + 26621.

It is an arithmetic number, because the mean of its divisors is an integer number (319188).

2^1223531 is an apocalyptic number.

1223531 is a deficient number, since it is larger than the sum of its proper divisors (53221).

1223531 is an equidigital number, since it uses as much as digits as its factorization.

1223531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53220.

The product of its digits is 180, while the sum is 17.

The square root of 1223531 is about 1106.1333554323. The cubic root of 1223531 is about 106.9559605647.

Adding to 1223531 its reverse (1353221), we get a palindrome (2576752).

The spelling of 1223531 in words is "one million, two hundred twenty-three thousand, five hundred thirty-one".