1220444231 has 4 divisors (see below), whose sum is σ = 1221318000. Its totient is φ = 1219570464.

The previous prime is 1220444213. The next prime is 1220444287. The reversal of 1220444231 is 1324440221.

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 1220444231 - 2²² = 1216249927 is a prime.

It is a super-2 number, since 2×1220444231² = 2978968241962362722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220444197 and 1220444206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220444531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434786 + ... + 437583.

It is an arithmetic number, because the mean of its divisors is an integer number (305329500).

Almost surely, 2^1220444231 is an apocalyptic number.

1220444231 is a deficient number, since it is larger than the sum of its proper divisors (873769).

1220444231 is an equidigital number, since it uses as much as digits as its factorization.

1220444231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873768.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1220444231 is about 34934.8569626383. The cubic root of 1220444231 is about 1068.6594067688.

Adding to 1220444231 its reverse (1324440221), we get a palindrome (2544884452).

The spelling of 1220444231 in words is "one billion, two hundred twenty million, four hundred forty-four thousand, two hundred thirty-one".