1020404191 has 2 divisors, whose sum is σ = 1020404192. Its totient is φ = 1020404190.

The previous prime is 1020404113. The next prime is 1020404221. The reversal of 1020404191 is 1914040201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1020404191 - 2¹¹ = 1020402143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020401191) 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 as a sum of consecutive naturals, namely, 510202095 + 510202096.

It is an arithmetic number, because the mean of its divisors is an integer number (510202096).

Almost surely, 2^1020404191 is an apocalyptic number.

1020404191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020404191 is an equidigital number, since it uses as much as digits as its factorization.

1020404191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1020404191 is about 31943.7660741497. The cubic root of 1020404191 is about 1006.7556553473.

Adding to 1020404191 its reverse (1914040201), we get a palindrome (2934444392).

The spelling of 1020404191 in words is "one billion, twenty million, four hundred four thousand, one hundred ninety-one".