61117220 has 24 divisors (see below), whose sum is σ = 128500344. Its totient is φ = 24417536.

The previous prime is 61117171. The next prime is 61117241. The reversal of 61117220 is 2271116.

It can be written as a sum of positive squares in 4 ways, for example, as 401956 + 60715264 = 634^2 + 7792^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 61117192 and 61117201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24344 + ... + 26736.

It is an arithmetic number, because the mean of its divisors is an integer number (5354181).

Almost surely, 2^61117220 is an apocalyptic number.

It is an amenable number.

61117220 is an abundant number, since it is smaller than the sum of its proper divisors (67383124).

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

61117220 is a wasteful number, since it uses less digits than its factorization.

61117220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3679 (or 3677 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 61117220 is about 7817.7503157878. The cubic root of 61117220 is about 393.9017078969.

Adding to 61117220 its reverse (2271116), we get a palindrome (63388336).

It can be divided in two parts, 6111 and 7220, that added together give a palindrome (13331).

The spelling of 61117220 in words is "sixty-one million, one hundred seventeen thousand, two hundred twenty".