1220331403 has 4 divisors (see below), whose sum is σ = 1221147000. Its totient is φ = 1219515808.

The previous prime is 1220331379. The next prime is 1220331439. The reversal of 1220331403 is 3041330221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3041330221 = 27691 ⋅109831.

It is a cyclic number.

It is not a de Polignac number, because 1220331403 - 2²⁵ = 1186776971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220334403) 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, 405550 + ... + 408547.

It is an arithmetic number, because the mean of its divisors is an integer number (305286750).

Almost surely, 2^1220331403 is an apocalyptic number.

1220331403 is a deficient number, since it is larger than the sum of its proper divisors (815597).

1220331403 is an equidigital number, since it uses as much as digits as its factorization.

1220331403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815596.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1220331403 is about 34933.2420911658. The cubic root of 1220331403 is about 1068.6264738371.

Adding to 1220331403 its reverse (3041330221), we get a palindrome (4261661624).

The spelling of 1220331403 in words is "one billion, two hundred twenty million, three hundred thirty-one thousand, four hundred three".