61721183 has 2 divisors, whose sum is σ = 61721184. Its totient is φ = 61721182.

The previous prime is 61721171. The next prime is 61721189. The reversal of 61721183 is 38112716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61721183 - 2¹⁰ = 61720159 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61721189) 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 as a sum of consecutive naturals, namely, 30860591 + 30860592.

It is an arithmetic number, because the mean of its divisors is an integer number (30860592).

Almost surely, 2^61721183 is an apocalyptic number.

61721183 is a deficient number, since it is larger than the sum of its proper divisors (1).

61721183 is an equidigital number, since it uses as much as digits as its factorization.

61721183 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 61721183 is about 7856.2830269791. The cubic root of 61721183 is about 395.1949750457.

Adding to 61721183 its reverse (38112716), we get a palindrome (99833899).

The spelling of 61721183 in words is "sixty-one million, seven hundred twenty-one thousand, one hundred eighty-three".