8521371457 has 2 divisors, whose sum is σ = 8521371458. Its totient is φ = 8521371456.

The previous prime is 8521371449. The next prime is 8521371461. The reversal of 8521371457 is 7541731258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8515782961 + 5588496 = 92281^2 + 2364^2 .

It is a cyclic number.

It is not a de Polignac number, because 8521371457 - 2³ = 8521371449 is a prime.

It is a super-2 number, since 2×8521371457² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8521371487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260685728 + 4260685729.

It is an arithmetic number, because the mean of its divisors is an integer number (4260685729).

Almost surely, 2^8521371457 is an apocalyptic number.

It is an amenable number.

8521371457 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521371457 is an equidigital number, since it uses as much as digits as its factorization.

8521371457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 235200, while the sum is 43.

The square root of 8521371457 is about 92311.2748097436. The cubic root of 8521371457 is about 2042.5365295966.

The spelling of 8521371457 in words is "eight billion, five hundred twenty-one million, three hundred seventy-one thousand, four hundred fifty-seven".