651613321 has 2 divisors, whose sum is σ = 651613322. Its totient is φ = 651613320.

The previous prime is 651613309. The next prime is 651613331. The reversal of 651613321 is 123316156.

651613321 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., 471758400 + 179854921 = 21720^2 + 13411^2 .

It is a cyclic number.

It is not a de Polignac number, because 651613321 - 2²¹ = 649516169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 651613321.

It is not a weakly prime, because it can be changed into another prime (651613331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325806660 + 325806661.

It is an arithmetic number, because the mean of its divisors is an integer number (325806661).

Almost surely, 2^651613321 is an apocalyptic number.

It is an amenable number.

651613321 is a deficient number, since it is larger than the sum of its proper divisors (1).

651613321 is an equidigital number, since it uses as much as digits as its factorization.

651613321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 28.

The square root of 651613321 is about 25526.7177874477. The cubic root of 651613321 is about 866.9551910332.

Adding to 651613321 its reverse (123316156), we get a palindrome (774929477).

The spelling of 651613321 in words is "six hundred fifty-one million, six hundred thirteen thousand, three hundred twenty-one".