60731221 has 2 divisors, whose sum is σ = 60731222. Its totient is φ = 60731220.

The previous prime is 60731219. The next prime is 60731227. The reversal of 60731221 is 12213706.

60731221 = 5510² + 5511².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30371121 + 30360100 = 5511^2 + 5510^2 .

It is a cyclic number.

It is not a de Polignac number, because 60731221 - 2¹ = 60731219 is a prime.

Together with 60731219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 60731192 and 60731201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (60731227) 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, 30365610 + 30365611.

It is an arithmetic number, because the mean of its divisors is an integer number (30365611).

Almost surely, 2^60731221 is an apocalyptic number.

60731221 is the 5511-st centered square number.

It is an amenable number.

60731221 is a deficient number, since it is larger than the sum of its proper divisors (1).

60731221 is an equidigital number, since it uses as much as digits as its factorization.

60731221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 60731221 is about 7793.0238675369. The cubic root of 60731221 is about 393.0706988642.

Adding to 60731221 its reverse (12213706), we get a palindrome (72944927).

The spelling of 60731221 in words is "sixty million, seven hundred thirty-one thousand, two hundred twenty-one".