97278257 has 2 divisors, whose sum is σ = 97278258. Its totient is φ = 97278256.

The previous prime is 97278239. The next prime is 97278263. The reversal of 97278257 is 75287279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85451536 + 11826721 = 9244^2 + 3439^2 .

It is a cyclic number.

It is not a de Polignac number, because 97278257 - 2¹⁸ = 97016113 is a prime.

It is not a weakly prime, because it can be changed into another prime (97278457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48639128 + 48639129.

It is an arithmetic number, because the mean of its divisors is an integer number (48639129).

Almost surely, 2^97278257 is an apocalyptic number.

It is an amenable number.

97278257 is a deficient number, since it is larger than the sum of its proper divisors (1).

97278257 is an equidigital number, since it uses as much as digits as its factorization.

97278257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 47.

The square root of 97278257 is about 9862.9740443742. The cubic root of 97278257 is about 459.9090194988.

The spelling of 97278257 in words is "ninety-seven million, two hundred seventy-eight thousand, two hundred fifty-seven".