1220320031 has 16 divisors (see below), whose sum is σ = 1416576000. Its totient is φ = 1029626208.

The previous prime is 1220320021. The next prime is 1220320081. The reversal of 1220320031 is 1300230221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1220320031 - 2⁶ = 1220319967 is a prime.

It is a super-2 number, since 2×1220320031² = 2978361956119681922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220319988 and 1220320015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220320021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189836 + ... + 196158.

It is an arithmetic number, because the mean of its divisors is an integer number (88536000).

Almost surely, 2^1220320031 is an apocalyptic number.

1220320031 is a deficient number, since it is larger than the sum of its proper divisors (196255969).

1220320031 is an equidigital number, since it uses as much as digits as its factorization.

1220320031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6758.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1220320031 is about 34933.0793231859. The cubic root of 1220320031 is about 1068.6231543951.

Adding to 1220320031 its reverse (1300230221), we get a palindrome (2520550252).

The spelling of 1220320031 in words is "one billion, two hundred twenty million, three hundred twenty thousand, thirty-one".