97889639 has 2 divisors, whose sum is σ = 97889640. Its totient is φ = 97889638.

The previous prime is 97889563. The next prime is 97889647. The reversal of 97889639 is 93698879.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97889639 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97889669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48944819 + 48944820.

It is an arithmetic number, because the mean of its divisors is an integer number (48944820).

Almost surely, 2^97889639 is an apocalyptic number.

97889639 is a deficient number, since it is larger than the sum of its proper divisors (1).

97889639 is an equidigital number, since it uses as much as digits as its factorization.

97889639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 59.

The square root of 97889639 is about 9893.9192941928. The cubic root of 97889639 is about 460.8704987718.

The spelling of 97889639 in words is "ninety-seven million, eight hundred eighty-nine thousand, six hundred thirty-nine".