720111811 has 2 divisors, whose sum is σ = 720111812. Its totient is φ = 720111810.

The previous prime is 720111767. The next prime is 720111817. The reversal of 720111811 is 118111027.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 720111811 - 2¹⁷ = 719980739 is a prime.

It is a super-2 number, since 2×720111811² = 1037122040683399442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (720111817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360055905 + 360055906.

It is an arithmetic number, because the mean of its divisors is an integer number (360055906).

Almost surely, 2^720111811 is an apocalyptic number.

720111811 is a deficient number, since it is larger than the sum of its proper divisors (1).

720111811 is an equidigital number, since it uses as much as digits as its factorization.

720111811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 22.

The square root of 720111811 is about 26834.8991240884. The cubic root of 720111811 is about 896.3273423124.

Adding to 720111811 its reverse (118111027), we get a palindrome (838222838).

The spelling of 720111811 in words is "seven hundred twenty million, one hundred eleven thousand, eight hundred eleven".