1020131111 has 4 divisors (see below), whose sum is σ = 1020527424. Its totient is φ = 1019734800.

The previous prime is 1020131051. The next prime is 1020131251. The reversal of 1020131111 is 1111310201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1111310201 = 53 ⋅20968117.

It is a cyclic number.

It is not a de Polignac number, because 1020131111 - 2¹⁰ = 1020130087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020131092 and 1020131101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020131311) 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, 194270 + ... + 199451.

It is an arithmetic number, because the mean of its divisors is an integer number (255131856).

Almost surely, 2^1020131111 is an apocalyptic number.

1020131111 is a deficient number, since it is larger than the sum of its proper divisors (396313).

1020131111 is an equidigital number, since it uses as much as digits as its factorization.

1020131111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396312.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1020131111 is about 31939.4914017115. The cubic root of 1020131111 is about 1006.6658382057.

Adding to 1020131111 its reverse (1111310201), we get a palindrome (2131441312).

The spelling of 1020131111 in words is "one billion, twenty million, one hundred thirty-one thousand, one hundred eleven".