1020220191 has 32 divisors (see below), whose sum is σ = 1534607040. Its totient is φ = 678144960.

The previous prime is 1020220171. The next prime is 1020220207. The reversal of 1020220191 is 1910220201.

It is not a de Polignac number, because 1020220191 - 2⁶ = 1020220127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020220111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1340251 + ... + 1341011.

It is an arithmetic number, because the mean of its divisors is an integer number (47956470).

Almost surely, 2^1020220191 is an apocalyptic number.

1020220191 is a deficient number, since it is larger than the sum of its proper divisors (514386849).

1020220191 is an frugal number, since it uses more digits than its factorization.

1020220191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395 (or 1377 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1020220191 is about 31940.8858831436. The cubic root of 1020220191 is about 1006.6951387475.

Adding to 1020220191 its reverse (1910220201), we get a palindrome (2930440392).

The spelling of 1020220191 in words is "one billion, twenty million, two hundred twenty thousand, one hundred ninety-one".