97867409 has 2 divisors, whose sum is σ = 97867410. Its totient is φ = 97867408.

The previous prime is 97867397. The next prime is 97867411. The reversal of 97867409 is 90476879.

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., 97614400 + 253009 = 9880^2 + 503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97867409 is a prime.

Together with 97867411, 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 (97867439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48933704 + 48933705.

It is an arithmetic number, because the mean of its divisors is an integer number (48933705).

Almost surely, 2^97867409 is an apocalyptic number.

It is an amenable number.

97867409 is a deficient number, since it is larger than the sum of its proper divisors (1).

97867409 is an equidigital number, since it uses as much as digits as its factorization.

97867409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 97867409 is about 9892.7958131157. The cubic root of 97867409 is about 460.8356093906.

The spelling of 97867409 in words is "ninety-seven million, eight hundred sixty-seven thousand, four hundred nine".