61843221 has 36 divisors (see below), whose sum is σ = 99279180. Its totient is φ = 37065600.

The previous prime is 61843219. The next prime is 61843231. The reversal of 61843221 is 12234816.

61843221 is a `hidden beast` number, since 618 + 43 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30371121 + 31472100 = 5511^2 + 5610^2 .

It is not a de Polignac number, because 61843221 - 2¹ = 61843219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61843231) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 118441 + ... + 118961.

It is an arithmetic number, because the mean of its divisors is an integer number (2757755).

Almost surely, 2^61843221 is an apocalyptic number.

It is an amenable number.

61843221 is a deficient number, since it is larger than the sum of its proper divisors (37435959).

61843221 is a wasteful number, since it uses less digits than its factorization.

61843221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658 (or 644 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 61843221 is about 7864.0460959992. The cubic root of 61843221 is about 395.4552695407.

The spelling of 61843221 in words is "sixty-one million, eight hundred forty-three thousand, two hundred twenty-one".