61767221 has 8 divisors (see below), whose sum is σ = 65243904. Its totient is φ = 58383360.

The previous prime is 61767217. The next prime is 61767227. The reversal of 61767221 is 12276716.

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

It is a cyclic number.

It is not a de Polignac number, because 61767221 - 2² = 61767217 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 (61767227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21836 + ... + 24501.

It is an arithmetic number, because the mean of its divisors is an integer number (8155488).

Almost surely, 2^61767221 is an apocalyptic number.

It is an amenable number.

61767221 is a deficient number, since it is larger than the sum of its proper divisors (3476683).

61767221 is a wasteful number, since it uses less digits than its factorization.

61767221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46411.

The product of its digits is 7056, while the sum is 32.

The square root of 61767221 is about 7859.2124923557. The cubic root of 61767221 is about 395.2932096312.

The spelling of 61767221 in words is "sixty-one million, seven hundred sixty-seven thousand, two hundred twenty-one".