100238981 has 2 divisors, whose sum is σ = 100238982. Its totient is φ = 100238980.

The previous prime is 100238959. The next prime is 100239049. The reversal of 100238981 is 189832001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99700225 + 538756 = 9985^2 + 734^2 .

It is a cyclic number.

It is not a de Polignac number, because 100238981 - 2⁶ = 100238917 is a prime.

It is a super-2 number, since 2×100238981² = 20095706623836722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100238081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50119490 + 50119491.

It is an arithmetic number, because the mean of its divisors is an integer number (50119491).

Almost surely, 2^100238981 is an apocalyptic number.

It is an amenable number.

100238981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100238981 is an equidigital number, since it uses as much as digits as its factorization.

100238981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 100238981 is about 10011.9419195279. The cubic root of 100238981 is about 464.5283397209.

The spelling of 100238981 in words is "one hundred million, two hundred thirty-eight thousand, nine hundred eighty-one".