9854421257 has 2 divisors, whose sum is σ = 9854421258. Its totient is φ = 9854421256.

The previous prime is 9854421253. The next prime is 9854421259. The reversal of 9854421257 is 7521244589.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9132478096 + 721943161 = 95564^2 + 26869^2 .

It is a cyclic number.

It is not a de Polignac number, because 9854421257 - 2² = 9854421253 is a prime.

Together with 9854421259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9854421253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4927210628 + 4927210629.

It is an arithmetic number, because the mean of its divisors is an integer number (4927210629).

Almost surely, 2^9854421257 is an apocalyptic number.

It is an amenable number.

9854421257 is a deficient number, since it is larger than the sum of its proper divisors (1).

9854421257 is an equidigital number, since it uses as much as digits as its factorization.

9854421257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806400, while the sum is 47.

The square root of 9854421257 is about 99269.4376784718. The cubic root of 9854421257 is about 2143.9288800043.

The spelling of 9854421257 in words is "nine billion, eight hundred fifty-four million, four hundred twenty-one thousand, two hundred fifty-seven".