98783981 has 2 divisors, whose sum is σ = 98783982. Its totient is φ = 98783980.

The previous prime is 98783941. The next prime is 98783999. The reversal of 98783981 is 18938789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59521225 + 39262756 = 7715^2 + 6266^2 .

It is an emirp because it is prime and its reverse (18938789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98783981 - 2¹⁸ = 98521837 is a prime.

It is a super-2 number, since 2×98783981² = 19516549804416722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98783921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49391990 + 49391991.

It is an arithmetic number, because the mean of its divisors is an integer number (49391991).

Almost surely, 2^98783981 is an apocalyptic number.

It is an amenable number.

98783981 is a deficient number, since it is larger than the sum of its proper divisors (1).

98783981 is an equidigital number, since it uses as much as digits as its factorization.

98783981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 53.

The square root of 98783981 is about 9939.0130797781. The cubic root of 98783981 is about 462.2697852078.

The spelling of 98783981 in words is "ninety-eight million, seven hundred eighty-three thousand, nine hundred eighty-one".