108628981 has 2 divisors, whose sum is σ = 108628982. Its totient is φ = 108628980.

The previous prime is 108628969. The next prime is 108629009. The reversal of 108628981 is 189826801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107972881 + 656100 = 10391^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 108628981 - 2¹⁹ = 108104693 is a prime.

It is a super-2 number, since 2×108628981² = 23600511026196722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108626981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54314490 + 54314491.

It is an arithmetic number, because the mean of its divisors is an integer number (54314491).

Almost surely, 2^108628981 is an apocalyptic number.

It is an amenable number.

108628981 is a deficient number, since it is larger than the sum of its proper divisors (1).

108628981 is an equidigital number, since it uses as much as digits as its factorization.

108628981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 43.

The square root of 108628981 is about 10422.5227752210. The cubic root of 108628981 is about 477.1430128750.

The spelling of 108628981 in words is "one hundred eight million, six hundred twenty-eight thousand, nine hundred eighty-one".