61969221 has 12 divisors (see below), whose sum is σ = 89675820. Its totient is φ = 41236800.

The previous prime is 61969213. The next prime is 61969231. The reversal of 61969221 is 12296916.

61969221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 43046721 + 18922500 = 6561^2 + 4350^2 .

It is not a de Polignac number, because 61969221 - 2³ = 61969213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61969231) 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 11 ways as a sum of consecutive naturals, for example, 930 + ... + 11171.

It is an arithmetic number, because the mean of its divisors is an integer number (7472985).

Almost surely, 2^61969221 is an apocalyptic number.

It is an amenable number.

61969221 is a deficient number, since it is larger than the sum of its proper divisors (27706599).

61969221 is a wasteful number, since it uses less digits than its factorization.

61969221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12676 (or 12673 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 61969221 is about 7872.0531629302. The cubic root of 61969221 is about 395.7236555326.

The spelling of 61969221 in words is "sixty-one million, nine hundred sixty-nine thousand, two hundred twenty-one".