1220813193 has 4 divisors (see below), whose sum is σ = 1627750928. Its totient is φ = 813875460.

The previous prime is 1220813179. The next prime is 1220813249. The reversal of 1220813193 is 3913180221.

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.

It is not a de Polignac number, because 1220813193 - 2⁴ = 1220813177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220813193.

It is not an unprimeable number, because it can be changed into a prime (1220813123) 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, 203468863 + ... + 203468868.

It is an arithmetic number, because the mean of its divisors is an integer number (406937732).

Almost surely, 2^1220813193 is an apocalyptic number.

It is an amenable number.

1220813193 is a deficient number, since it is larger than the sum of its proper divisors (406937735).

1220813193 is an equidigital number, since it uses as much as digits as its factorization.

1220813193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406937734.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1220813193 is about 34940.1372779215. The cubic root of 1220813193 is about 1068.7670875008.

The spelling of 1220813193 in words is "one billion, two hundred twenty million, eight hundred thirteen thousand, one hundred ninety-three".