100818661 has 2 divisors, whose sum is σ = 100818662. Its totient is φ = 100818660.

The previous prime is 100818659. The next prime is 100818709. The reversal of 100818661 is 166818001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63840100 + 36978561 = 7990^2 + 6081^2 .

It is a cyclic number.

It is not a de Polignac number, because 100818661 - 2¹ = 100818659 is a prime.

Together with 100818659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100818611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50409330 + 50409331.

It is an arithmetic number, because the mean of its divisors is an integer number (50409331).

Almost surely, 2^100818661 is an apocalyptic number.

It is an amenable number.

100818661 is a deficient number, since it is larger than the sum of its proper divisors (1).

100818661 is an equidigital number, since it uses as much as digits as its factorization.

100818661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 100818661 is about 10040.8496154459. The cubic root of 100818661 is about 465.4220717819.

The spelling of 100818661 in words is "one hundred million, eight hundred eighteen thousand, six hundred sixty-one".