61727521 has 2 divisors, whose sum is σ = 61727522. Its totient is φ = 61727520.

The previous prime is 61727513. The next prime is 61727531. The reversal of 61727521 is 12572716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41152225 + 20575296 = 6415^2 + 4536^2 .

It is a cyclic number.

It is not a de Polignac number, because 61727521 - 2³ = 61727513 is a prime.

It is not a weakly prime, because it can be changed into another prime (61727531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30863760 + 30863761.

It is an arithmetic number, because the mean of its divisors is an integer number (30863761).

Almost surely, 2^61727521 is an apocalyptic number.

It is an amenable number.

61727521 is a deficient number, since it is larger than the sum of its proper divisors (1).

61727521 is an equidigital number, since it uses as much as digits as its factorization.

61727521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5880, while the sum is 31.

The square root of 61727521 is about 7856.6863880392. The cubic root of 61727521 is about 395.2085017902.

The spelling of 61727521 in words is "sixty-one million, seven hundred twenty-seven thousand, five hundred twenty-one".