61198218 has 12 divisors (see below), whose sum is σ = 132596178. Its totient is φ = 20399400.

The previous prime is 61198217. The next prime is 61198243. The reversal of 61198218 is 81289116.

It can be written as a sum of positive squares in only one way, i.e., 59028489 + 2169729 = 7683^2 + 1473^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61198213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1699933 + ... + 1699968.

Almost surely, 2^61198218 is an apocalyptic number.

61198218 is an abundant number, since it is smaller than the sum of its proper divisors (71397960).

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

61198218 is a wasteful number, since it uses less digits than its factorization.

61198218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3399909 (or 3399906 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 61198218 is about 7822.9289911132. The cubic root of 61198218 is about 394.0756423262.

It can be divided in two parts, 61198 and 218, that added together give a palindrome (61416).

The spelling of 61198218 in words is "sixty-one million, one hundred ninety-eight thousand, two hundred eighteen".