61217112 has 64 divisors (see below), whose sum is σ = 167650560. Its totient is φ = 18473600.

The previous prime is 61217089. The next prime is 61217113. The reversal of 61217112 is 21171216.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61217113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121453 + ... + 121955.

It is an arithmetic number, because the mean of its divisors is an integer number (2619540).

Almost surely, 2^61217112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61217112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83825280).

61217112 is an abundant number, since it is smaller than the sum of its proper divisors (106433448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61217112 is a wasteful number, since it uses less digits than its factorization.

61217112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984 (or 980 counting only the distinct ones).

The product of its digits is 168, while the sum is 21.

The square root of 61217112 is about 7824.1365018767. The cubic root of 61217112 is about 394.1161930662.

Adding to 61217112 its reverse (21171216), we get a palindrome (82388328).

The spelling of 61217112 in words is "sixty-one million, two hundred seventeen thousand, one hundred twelve".