100201681 has 2 divisors, whose sum is σ = 100201682. Its totient is φ = 100201680.

The previous prime is 100201669. The next prime is 100201691. The reversal of 100201681 is 186102001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96530625 + 3671056 = 9825^2 + 1916^2 .

It is a cyclic number.

It is not a de Polignac number, because 100201681 - 2¹¹ = 100199633 is a prime.

It is a super-2 number, since 2×100201681² = 20080753750451522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100201691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50100840 + 50100841.

It is an arithmetic number, because the mean of its divisors is an integer number (50100841).

Almost surely, 2^100201681 is an apocalyptic number.

It is an amenable number.

100201681 is a deficient number, since it is larger than the sum of its proper divisors (1).

100201681 is an equidigital number, since it uses as much as digits as its factorization.

100201681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 100201681 is about 10010.0789707175. The cubic root of 100201681 is about 464.4707139133.

Adding to 100201681 its reverse (186102001), we get a palindrome (286303682).

The spelling of 100201681 in words is "one hundred million, two hundred one thousand, six hundred eighty-one".