97878281 has 2 divisors, whose sum is σ = 97878282. Its totient is φ = 97878280.

The previous prime is 97878269. The next prime is 97878289. The reversal of 97878281 is 18287879.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65205625 + 32672656 = 8075^2 + 5716^2 .

It is a cyclic number.

It is not a de Polignac number, because 97878281 - 2⁶ = 97878217 is a prime.

It is a super-2 number, since 2×97878281² = 19160315783029922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97878289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48939140 + 48939141.

It is an arithmetic number, because the mean of its divisors is an integer number (48939141).

Almost surely, 2^97878281 is an apocalyptic number.

It is an amenable number.

97878281 is a deficient number, since it is larger than the sum of its proper divisors (1).

97878281 is an equidigital number, since it uses as much as digits as its factorization.

97878281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 50.

The square root of 97878281 is about 9893.3452886271. The cubic root of 97878281 is about 460.8526733593.

The spelling of 97878281 in words is "ninety-seven million, eight hundred seventy-eight thousand, two hundred eighty-one".