8351501621 has 2 divisors, whose sum is σ = 8351501622. Its totient is φ = 8351501620.

The previous prime is 8351501533. The next prime is 8351501647. The reversal of 8351501621 is 1261051538.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6321999121 + 2029502500 = 79511^2 + 45050^2 .

It is a cyclic number.

It is not a de Polignac number, because 8351501621 - 2²² = 8347307317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8351501671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4175750810 + 4175750811.

It is an arithmetic number, because the mean of its divisors is an integer number (4175750811).

Almost surely, 2^8351501621 is an apocalyptic number.

It is an amenable number.

8351501621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8351501621 is an equidigital number, since it uses as much as digits as its factorization.

8351501621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 8351501621 is about 91386.5505476599. The cubic root of 8351501621 is about 2028.8729716775.

The spelling of 8351501621 in words is "eight billion, three hundred fifty-one million, five hundred one thousand, six hundred twenty-one".