651320821241 has 2 divisors, whose sum is σ = 651320821242. Its totient is φ = 651320821240.

The previous prime is 651320821223. The next prime is 651320821259. The reversal of 651320821241 is 142128023156.

It is a balanced prime because it is at equal distance from previous prime (651320821223) and next prime (651320821259).

It can be written as a sum of positive squares in only one way, i.e., 337613292025 + 313707529216 = 581045^2 + 560096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651320821241 is a prime.

It is not a weakly prime, because it can be changed into another prime (651320821441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325660410620 + 325660410621.

It is an arithmetic number, because the mean of its divisors is an integer number (325660410621).

Almost surely, 2^651320821241 is an apocalyptic number.

It is an amenable number.

651320821241 is a deficient number, since it is larger than the sum of its proper divisors (1).

651320821241 is an equidigital number, since it uses as much as digits as its factorization.

651320821241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

Adding to 651320821241 its reverse (142128023156), we get a palindrome (793448844397).

The spelling of 651320821241 in words is "six hundred fifty-one billion, three hundred twenty million, eight hundred twenty-one thousand, two hundred forty-one".