98657639 has 2 divisors, whose sum is σ = 98657640. Its totient is φ = 98657638.

The previous prime is 98657627. The next prime is 98657641. The reversal of 98657639 is 93675689.

It is a strong prime.

It is an emirp because it is prime and its reverse (93675689) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98657639 - 2¹² = 98653543 is a prime.

Together with 98657641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98657659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49328819 + 49328820.

It is an arithmetic number, because the mean of its divisors is an integer number (49328820).

Almost surely, 2^98657639 is an apocalyptic number.

98657639 is a deficient number, since it is larger than the sum of its proper divisors (1).

98657639 is an equidigital number, since it uses as much as digits as its factorization.

98657639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 53.

The square root of 98657639 is about 9932.6551837865. The cubic root of 98657639 is about 462.0726243409.

The spelling of 98657639 in words is "ninety-eight million, six hundred fifty-seven thousand, six hundred thirty-nine".