9920257 has 2 divisors, whose sum is σ = 9920258. Its totient is φ = 9920256.

The previous prime is 9920249. The next prime is 9920293. The reversal of 9920257 is 7520299.

9920257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6230016 + 3690241 = 2496^2 + 1921^2 .

It is a cyclic number.

It is not a de Polignac number, because 9920257 - 2³ = 9920249 is a prime.

It is a super-2 number, since 2×9920257² = 196822997892098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9920357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4960128 + 4960129.

It is an arithmetic number, because the mean of its divisors is an integer number (4960129).

Almost surely, 2^9920257 is an apocalyptic number.

It is an amenable number.

9920257 is a deficient number, since it is larger than the sum of its proper divisors (1).

9920257 is an equidigital number, since it uses as much as digits as its factorization.

9920257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 9920257 is about 3149.6439481313. The cubic root of 9920257 is about 214.8692697236.

The spelling of 9920257 in words is "nine million, nine hundred twenty thousand, two hundred fifty-seven".