61117111 has 8 divisors (see below), whose sum is σ = 66733200. Its totient is φ = 55511040.

The previous prime is 61117103. The next prime is 61117127. The reversal of 61117111 is 11171116.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61117111 - 2³ = 61117103 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 (61117171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16695 + ... + 20023.

It is an arithmetic number, because the mean of its divisors is an integer number (8341650).

Almost surely, 2^61117111 is an apocalyptic number.

61117111 is a deficient number, since it is larger than the sum of its proper divisors (5616089).

61117111 is a wasteful number, since it uses less digits than its factorization.

61117111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5009.

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

The square root of 61117111 is about 7817.7433444697. The cubic root of 61117111 is about 393.9014737277.

Adding to 61117111 its reverse (11171116), we get a palindrome (72288227).

The spelling of 61117111 in words is "sixty-one million, one hundred seventeen thousand, one hundred eleven".