61111117 has 4 divisors (see below), whose sum is σ = 61126780. Its totient is φ = 61095456.

The previous prime is 61111111. The next prime is 61111121. The reversal of 61111117 is 71111116.

It is a happy number.

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 can be written as a sum of positive squares in 2 ways, for example, as 36796356 + 24314761 = 6066^2 + 4931^2 .

It is a cyclic number.

It is not a de Polignac number, because 61111117 - 2¹⁵ = 61078349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61111094 and 61111103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61111111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3223 + ... + 11515.

It is an arithmetic number, because the mean of its divisors is an integer number (15281695).

Almost surely, 2^61111117 is an apocalyptic number.

It is an amenable number.

61111117 is a deficient number, since it is larger than the sum of its proper divisors (15663).

61111117 is an equidigital number, since it uses as much as digits as its factorization.

61111117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15662.

The product of its digits is 42, while the sum is 19.

The square root of 61111117 is about 7817.3599763603. The cubic root of 61111117 is about 393.8885961413. Note that the first 3 decimals are identical.

Subtracting 61111117 from its reverse (71111116), we obtain a palindrome (9999999).

The spelling of 61111117 in words is "sixty-one million, one hundred eleven thousand, one hundred seventeen".