97805639 has 2 divisors, whose sum is σ = 97805640. Its totient is φ = 97805638.

The previous prime is 97805627. The next prime is 97805663. The reversal of 97805639 is 93650879.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97805639 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 97805593 and 97805602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97805699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48902819 + 48902820.

It is an arithmetic number, because the mean of its divisors is an integer number (48902820).

Almost surely, 2^97805639 is an apocalyptic number.

97805639 is a deficient number, since it is larger than the sum of its proper divisors (1).

97805639 is an equidigital number, since it uses as much as digits as its factorization.

97805639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 97805639 is about 9889.6733515319. The cubic root of 97805639 is about 460.7386353083.

The spelling of 97805639 in words is "ninety-seven million, eight hundred five thousand, six hundred thirty-nine".