61133221 has 4 divisors (see below), whose sum is σ = 62286732. Its totient is φ = 59979712.

The previous prime is 61133197. The next prime is 61133227. The reversal of 61133221 is 12233116.

61133221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17056900 + 44076321 = 4130^2 + 6639^2 .

It is a cyclic number.

It is not a de Polignac number, because 61133221 - 2¹¹ = 61131173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61133227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 576676 + ... + 576781.

It is an arithmetic number, because the mean of its divisors is an integer number (15571683).

Almost surely, 2^61133221 is an apocalyptic number.

It is an amenable number.

61133221 is a deficient number, since it is larger than the sum of its proper divisors (1153511).

61133221 is a wasteful number, since it uses less digits than its factorization.

61133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153510.

The product of its digits is 216, while the sum is 19.

The square root of 61133221 is about 7818.7736250642. The cubic root of 61133221 is about 393.9360804860.

Adding to 61133221 its reverse (12233116), we get a palindrome (73366337).

The spelling of 61133221 in words is "sixty-one million, one hundred thirty-three thousand, two hundred twenty-one".