61111811 has 4 divisors (see below), whose sum is σ = 61308624. Its totient is φ = 60915000.

The previous prime is 61111783. The next prime is 61111823. The reversal of 61111811 is 11811116.

61111811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61111811 - 2¹⁴ = 61095427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61111861) 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 in 3 ways as a sum of consecutive naturals, for example, 97940 + ... + 98561.

It is an arithmetic number, because the mean of its divisors is an integer number (15327156).

Almost surely, 2^61111811 is an apocalyptic number.

61111811 is a deficient number, since it is larger than the sum of its proper divisors (196813).

61111811 is a wasteful number, since it uses less digits than its factorization.

61111811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196812.

The product of its digits is 48, while the sum is 20.

The square root of 61111811 is about 7817.4043646213. The cubic root of 61111811 is about 393.8900871829.

Adding to 61111811 its reverse (11811116), we get a palindrome (72922927).

The spelling of 61111811 in words is "sixty-one million, one hundred eleven thousand, eight hundred eleven".