1220120197 has 4 divisors (see below), whose sum is σ = 1222311276. Its totient is φ = 1217929120.

The previous prime is 1220120179. The next prime is 1220120201. The reversal of 1220120197 is 7910210221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 782097156 + 438023041 = 27966^2 + 20929^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220120197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220120117) 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, 1094704 + ... + 1095817.

It is an arithmetic number, because the mean of its divisors is an integer number (305577819).

Almost surely, 2^1220120197 is an apocalyptic number.

It is an amenable number.

1220120197 is a deficient number, since it is larger than the sum of its proper divisors (2191079).

1220120197 is an equidigital number, since it uses as much as digits as its factorization.

1220120197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191078.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 1220120197 is about 34930.2189658181. The cubic root of 1220120197 is about 1068.5648202719.

The spelling of 1220120197 in words is "one billion, two hundred twenty million, one hundred twenty thousand, one hundred ninety-seven".