1220332331 has 4 divisors (see below), whose sum is σ = 1220502192. Its totient is φ = 1220162472.

The previous prime is 1220332319. The next prime is 1220332349. The reversal of 1220332331 is 1332330221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1332330221 = 647 ⋅2059243.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220332331 is a prime.

It is a super-2 number, since 2×1220332331² = 2978421996167787122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220332381) 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, 73655 + ... + 88688.

It is an arithmetic number, because the mean of its divisors is an integer number (305125548).

Almost surely, 2^1220332331 is an apocalyptic number.

1220332331 is a deficient number, since it is larger than the sum of its proper divisors (169861).

1220332331 is an equidigital number, since it uses as much as digits as its factorization.

1220332331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169860.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 1220332331 is about 34933.2553736407. The cubic root of 1220332331 is about 1068.6267447157.

Adding to 1220332331 its reverse (1332330221), we get a palindrome (2552662552).

The spelling of 1220332331 in words is "one billion, two hundred twenty million, three hundred thirty-two thousand, three hundred thirty-one".