988649 has 2 divisors, whose sum is σ = 988650. Its totient is φ = 988648.

The previous prime is 988643. The next prime is 988651. The reversal of 988649 is 946889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 753424 + 235225 = 868^2 + 485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988649 is a prime.

Together with 988651, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (988643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494324 + 494325.

It is an arithmetic number, because the mean of its divisors is an integer number (494325).

2⁹⁸⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

988649 is a deficient number, since it is larger than the sum of its proper divisors (1).

988649 is an equidigital number, since it uses as much as digits as its factorization.

988649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 44.

The square root of 988649 is about 994.3083022886. The cubic root of 988649 is about 99.6201926232.

The spelling of 988649 in words is "nine hundred eighty-eight thousand, six hundred forty-nine".