1220645333 has 4 divisors (see below), whose sum is σ = 1221162528. Its totient is φ = 1220128140.

The previous prime is 1220645287. The next prime is 1220645347. The reversal of 1220645333 is 3335460221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3335460221 = 31 ⋅107595491.

It is a cyclic number.

It is not a de Polignac number, because 1220645333 - 2¹² = 1220641237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220645296 and 1220645305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220645383) 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, 255041 + ... + 259782.

It is an arithmetic number, because the mean of its divisors is an integer number (305290632).

Almost surely, 2^1220645333 is an apocalyptic number.

It is an amenable number.

1220645333 is a deficient number, since it is larger than the sum of its proper divisors (517195).

1220645333 is an equidigital number, since it uses as much as digits as its factorization.

1220645333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517194.

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 1220645333 is about 34937.7350868656. The cubic root of 1220645333 is about 1068.7181006267.

The spelling of 1220645333 in words is "one billion, two hundred twenty million, six hundred forty-five thousand, three hundred thirty-three".