61112111 has 4 divisors (see below), whose sum is σ = 61127832. Its totient is φ = 61096392.

The previous prime is 61112101. The next prime is 61112137. The reversal of 61112111 is 11121116.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61112111 - 2⁶ = 61112047 is a prime.

It is a super-2 number, since 2×61112111² = 7469380221752642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61112101) 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 in 3 ways as a sum of consecutive naturals, for example, 2705 + ... + 11381.

It is an arithmetic number, because the mean of its divisors is an integer number (15281958).

Almost surely, 2^61112111 is an apocalyptic number.

61112111 is a deficient number, since it is larger than the sum of its proper divisors (15721).

61112111 is an equidigital number, since it uses as much as digits as its factorization.

61112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15720.

The product of its digits is 12, while the sum is 14.

The square root of 61112111 is about 7817.4235525523. The cubic root of 61112111 is about 393.8907317219.

Adding to 61112111 its reverse (11121116), we get a palindrome (72233227).

The spelling of 61112111 in words is "sixty-one million, one hundred twelve thousand, one hundred eleven".