61228111 has 4 divisors (see below), whose sum is σ = 69974992. Its totient is φ = 52481232.

The previous prime is 61228061. The next prime is 61228117. The reversal of 61228111 is 11182216.

61228111 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 61228111 - 2¹⁹ = 60703823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61228117) 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, 4373430 + ... + 4373443.

It is an arithmetic number, because the mean of its divisors is an integer number (17493748).

Almost surely, 2^61228111 is an apocalyptic number.

61228111 is a deficient number, since it is larger than the sum of its proper divisors (8746881).

61228111 is an equidigital number, since it uses as much as digits as its factorization.

61228111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8746880.

The product of its digits is 192, while the sum is 22.

The square root of 61228111 is about 7824.8393593735. The cubic root of 61228111 is about 394.1397955322.

The spelling of 61228111 in words is "sixty-one million, two hundred twenty-eight thousand, one hundred eleven".