1220312331 has 16 divisors (see below), whose sum is σ = 2066137600. Its totient is φ = 697321224.

The previous prime is 1220312323. The next prime is 1220312341. The reversal of 1220312331 is 1332130221.

1220312331 is a `hidden beast` number, since 1 + 2 + 20 + 312 + 331 = 666.

It is not a de Polignac number, because 1220312331 - 2³ = 1220312323 is a prime.

It is a super-2 number, since 2×1220312331² = 2978324370381307122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220312321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3228151 + ... + 3228528.

It is an arithmetic number, because the mean of its divisors is an integer number (129133600).

Almost surely, 2^1220312331 is an apocalyptic number.

1220312331 is a deficient number, since it is larger than the sum of its proper divisors (845825269).

1220312331 is an equidigital number, since it uses as much as digits as its factorization.

1220312331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6456695 (or 6456689 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1220312331 is about 34932.9691122870. The cubic root of 1220312331 is about 1068.6209067837.

Adding to 1220312331 its reverse (1332130221), we get a palindrome (2552442552).

The spelling of 1220312331 in words is "one billion, two hundred twenty million, three hundred twelve thousand, three hundred thirty-one".