1020401111 has 4 divisors (see below), whose sum is σ = 1020489192. Its totient is φ = 1020313032.

The previous prime is 1020401101. The next prime is 1020401117. The reversal of 1020401111 is 1111040201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1111040201 = 491 ⋅2262811.

It is a cyclic number.

It is not a de Polignac number, because 1020401111 - 2¹⁸ = 1020138967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020401092 and 1020401101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020401117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23456 + ... + 50901.

It is an arithmetic number, because the mean of its divisors is an integer number (255122298).

Almost surely, 2^1020401111 is an apocalyptic number.

1020401111 is a deficient number, since it is larger than the sum of its proper divisors (88081).

1020401111 is an equidigital number, since it uses as much as digits as its factorization.

1020401111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88080.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1020401111 is about 31943.7178643939. The cubic root of 1020401111 is about 1006.7546424119.

Adding to 1020401111 its reverse (1111040201), we get a palindrome (2131441312).

The spelling of 1020401111 in words is "one billion, twenty million, four hundred one thousand, one hundred eleven".