98987639 has 2 divisors, whose sum is σ = 98987640. Its totient is φ = 98987638.

The previous prime is 98987579. The next prime is 98987641. The reversal of 98987639 is 93678989.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98987639 is a prime.

Together with 98987641, 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 (98987939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49493819 + 49493820.

It is an arithmetic number, because the mean of its divisors is an integer number (49493820).

Almost surely, 2^98987639 is an apocalyptic number.

98987639 is a deficient number, since it is larger than the sum of its proper divisors (1).

98987639 is an equidigital number, since it uses as much as digits as its factorization.

98987639 is an evil number, because the sum of its binary digits is even.

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

The square root of 98987639 is about 9949.2531880539. The cubic root of 98987639 is about 462.5872466524.

The spelling of 98987639 in words is "ninety-eight million, nine hundred eighty-seven thousand, six hundred thirty-nine".