1020506111 has 4 divisors (see below), whose sum is σ = 1020943272. Its totient is φ = 1020068952.

The previous prime is 1020506099. The next prime is 1020506167. The reversal of 1020506111 is 1116050201.

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

It is a cyclic number.

It is not a de Polignac number, because 1020506111 - 2¹⁴ = 1020489727 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 1020506111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020506411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215060 + ... + 219753.

It is an arithmetic number, because the mean of its divisors is an integer number (255235818).

Almost surely, 2^1020506111 is an apocalyptic number.

1020506111 is a deficient number, since it is larger than the sum of its proper divisors (437161).

1020506111 is an equidigital number, since it uses as much as digits as its factorization.

1020506111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437160.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1020506111 is about 31945.3613377592. The cubic root of 1020506111 is about 1006.7891731504.

Adding to 1020506111 its reverse (1116050201), we get a palindrome (2136556312).

The spelling of 1020506111 in words is "one billion, twenty million, five hundred six thousand, one hundred eleven".