4020218591 has 2 divisors, whose sum is σ = 4020218592. Its totient is φ = 4020218590.

The previous prime is 4020218567. The next prime is 4020218611. The reversal of 4020218591 is 1958120204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4020218591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4020218791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010109295 + 2010109296.

It is an arithmetic number, because the mean of its divisors is an integer number (2010109296).

Almost surely, 2^4020218591 is an apocalyptic number.

4020218591 is a deficient number, since it is larger than the sum of its proper divisors (1).

4020218591 is an equidigital number, since it uses as much as digits as its factorization.

4020218591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 4020218591 is about 63405.1937225966. The cubic root of 4020218591 is about 1590.0711426048.

Adding to 4020218591 its reverse (1958120204), we get a palindrome (5978338795).

The spelling of 4020218591 in words is "four billion, twenty million, two hundred eighteen thousand, five hundred ninety-one".