61221185 has 8 divisors (see below), whose sum is σ = 73533096. Its totient is φ = 48931840.

The previous prime is 61221169. The next prime is 61221191. The reversal of 61221185 is 58112216.

It can be written as a sum of positive squares in 4 ways, for example, as 4490161 + 56731024 = 2119^2 + 7532^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61221185 - 2⁴ = 61221169 is a prime.

It is a Duffinian number.

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, 1055 + ... + 11115.

It is an arithmetic number, because the mean of its divisors is an integer number (9191637).

Almost surely, 2^61221185 is an apocalyptic number.

It is an amenable number.

61221185 is a deficient number, since it is larger than the sum of its proper divisors (12311911).

61221185 is a wasteful number, since it uses less digits than its factorization.

61221185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11283.

The product of its digits is 960, while the sum is 26.

The square root of 61221185 is about 7824.3967818612. The cubic root of 61221185 is about 394.1249335398.

The spelling of 61221185 in words is "sixty-one million, two hundred twenty-one thousand, one hundred eighty-five".