1020111101 has 4 divisors (see below), whose sum is σ = 1020560604. Its totient is φ = 1019661600.

The previous prime is 1020111091. The next prime is 1020111107. The reversal of 1020111101 is 1011110201.

It is a happy number.

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 547092100 + 473019001 = 23390^2 + 21749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020111101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020111107) 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 3 ways as a sum of consecutive naturals, for example, 221330 + ... + 225891.

It is an arithmetic number, because the mean of its divisors is an integer number (255140151).

Almost surely, 2^1020111101 is an apocalyptic number.

It is an amenable number.

1020111101 is a deficient number, since it is larger than the sum of its proper divisors (449503).

1020111101 is an equidigital number, since it uses as much as digits as its factorization.

1020111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449502.

The product of its (nonzero) digits is 2, while the sum is 8.

The square root of 1020111101 is about 31939.1781516056. The cubic root of 1020111101 is about 1006.6592562037.

Adding to 1020111101 its reverse (1011110201), we get a palindrome (2031221302).

The spelling of 1020111101 in words is "one billion, twenty million, one hundred eleven thousand, one hundred one".