98669981 has 2 divisors, whose sum is σ = 98669982. Its totient is φ = 98669980.

The previous prime is 98669969. The next prime is 98669999. The reversal of 98669981 is 18996689.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80102500 + 18567481 = 8950^2 + 4309^2 .

It is a cyclic number.

It is not a de Polignac number, because 98669981 - 2²² = 94475677 is a prime.

It is a super-2 number, since 2×98669981² = 19471530301080722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98669911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49334990 + 49334991.

It is an arithmetic number, because the mean of its divisors is an integer number (49334991).

Almost surely, 2^98669981 is an apocalyptic number.

It is an amenable number.

98669981 is a deficient number, since it is larger than the sum of its proper divisors (1).

98669981 is an equidigital number, since it uses as much as digits as its factorization.

98669981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 56.

The square root of 98669981 is about 9933.2764483830. The cubic root of 98669981 is about 462.0918918556.

The spelling of 98669981 in words is "ninety-eight million, six hundred sixty-nine thousand, nine hundred eighty-one".