9854315976521 has 2 divisors, whose sum is σ = 9854315976522. Its totient is φ = 9854315976520.

The previous prime is 9854315976503. The next prime is 9854315976559. The reversal of 9854315976521 is 1256795134589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9841741494025 + 12574482496 = 3137155^2 + 112136^2 .

It is an emirp because it is prime and its reverse (1256795134589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9854315976521 - 2²⁶ = 9854248867657 is a prime.

It is a pancake number, because a pancake can be divided into 9854315976521 parts by 4439440 straight cuts.

It is not a weakly prime, because it can be changed into another prime (9854315976121) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4927157988260 + 4927157988261.

It is an arithmetic number, because the mean of its divisors is an integer number (4927157988261).

Almost surely, 2^{9854315976521} is an apocalyptic number.

It is an amenable number.

9854315976521 is a deficient number, since it is larger than the sum of its proper divisors (1).

9854315976521 is an equidigital number, since it uses as much as digits as its factorization.

9854315976521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648000, while the sum is 65.

The spelling of 9854315976521 in words is "nine trillion, eight hundred fifty-four billion, three hundred fifteen million, nine hundred seventy-six thousand, five hundred twenty-one".