108939881 has 2 divisors, whose sum is σ = 108939882. Its totient is φ = 108939880.

The previous prime is 108939869. The next prime is 108939899. The reversal of 108939881 is 188939801.

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., 95726656 + 13213225 = 9784^2 + 3635^2 .

It is a cyclic number.

It is not a de Polignac number, because 108939881 - 2¹⁴ = 108923497 is a prime.

It is a super-2 number, since 2×108939881² = 23735795344588322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (108939821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54469940 + 54469941.

It is an arithmetic number, because the mean of its divisors is an integer number (54469941).

Almost surely, 2^108939881 is an apocalyptic number.

It is an amenable number.

108939881 is a deficient number, since it is larger than the sum of its proper divisors (1).

108939881 is an equidigital number, since it uses as much as digits as its factorization.

108939881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 47.

The square root of 108939881 is about 10437.4269338760. The cubic root of 108939881 is about 477.5977793784.

The spelling of 108939881 in words is "one hundred eight million, nine hundred thirty-nine thousand, eight hundred eighty-one".