98717639 has 2 divisors, whose sum is σ = 98717640. Its totient is φ = 98717638.

The previous prime is 98717617. The next prime is 98717687. The reversal of 98717639 is 93671789.

It is a weak prime.

It is an emirp because it is prime and its reverse (93671789) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98717639 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98717699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49358819 + 49358820.

It is an arithmetic number, because the mean of its divisors is an integer number (49358820).

Almost surely, 2^98717639 is an apocalyptic number.

98717639 is a deficient number, since it is larger than the sum of its proper divisors (1).

98717639 is an equidigital number, since it uses as much as digits as its factorization.

98717639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 50.

The square root of 98717639 is about 9935.6750651377. The cubic root of 98717639 is about 462.1662772985.

The spelling of 98717639 in words is "ninety-eight million, seven hundred seventeen thousand, six hundred thirty-nine".