61117221 has 24 divisors (see below), whose sum is σ = 90512352. Its totient is φ = 36652000.

The previous prime is 61117171. The next prime is 61117241. The reversal of 61117221 is 12271116.

It is a happy number.

It is not a de Polignac number, because 61117221 - 2¹⁵ = 61084453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61117241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35830 + ... + 37496.

It is an arithmetic number, because the mean of its divisors is an integer number (3771348).

Almost surely, 2^61117221 is an apocalyptic number.

It is an amenable number.

61117221 is a deficient number, since it is larger than the sum of its proper divisors (29395131).

61117221 is a wasteful number, since it uses less digits than its factorization.

61117221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793 (or 1782 counting only the distinct ones).

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

The square root of 61117221 is about 7817.7503797448. The cubic root of 61117221 is about 393.9017100452.

Adding to 61117221 its reverse (12271116), we get a palindrome (73388337).

The spelling of 61117221 in words is "sixty-one million, one hundred seventeen thousand, two hundred twenty-one".