100603981 has 2 divisors, whose sum is σ = 100603982. Its totient is φ = 100603980.

The previous prime is 100603969. The next prime is 100603991. The reversal of 100603981 is 189306001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56115081 + 44488900 = 7491^2 + 6670^2 .

It is an emirp because it is prime and its reverse (189306001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100603981 - 2⁹ = 100603469 is a prime.

It is a super-2 number, since 2×100603981² = 20242321986096722, 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 (100603931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50301990 + 50301991.

It is an arithmetic number, because the mean of its divisors is an integer number (50301991).

Almost surely, 2^100603981 is an apocalyptic number.

It is an amenable number.

100603981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100603981 is an equidigital number, since it uses as much as digits as its factorization.

100603981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 100603981 is about 10030.1535880564. The cubic root of 100603981 is about 465.0914854490.

Adding to 100603981 its reverse (189306001), we get a palindrome (289909982).

It can be divided in two parts, 10060 and 3981, that added together give a palindrome (14041).

The spelling of 100603981 in words is "one hundred million, six hundred three thousand, nine hundred eighty-one".