61327681 has 2 divisors, whose sum is σ = 61327682. Its totient is φ = 61327680.

The previous prime is 61327667. The next prime is 61327691. The reversal of 61327681 is 18672316.

61327681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46117681 + 15210000 = 6791^2 + 3900^2 .

It is a cyclic number.

It is not a de Polignac number, because 61327681 - 2⁹ = 61327169 is a prime.

It is a super-2 number, since 2×61327681² = 7522168913675522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61327661) 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 as a sum of consecutive naturals, namely, 30663840 + 30663841.

It is an arithmetic number, because the mean of its divisors is an integer number (30663841).

Almost surely, 2^61327681 is an apocalyptic number.

It is an amenable number.

61327681 is a deficient number, since it is larger than the sum of its proper divisors (1).

61327681 is an equidigital number, since it uses as much as digits as its factorization.

61327681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 61327681 is about 7831.1992057411. The cubic root of 61327681 is about 394.3533316824.

Adding to 61327681 its reverse (18672316), we get a palindrome (79999997).

The spelling of 61327681 in words is "sixty-one million, three hundred twenty-seven thousand, six hundred eighty-one".