108121997 has 2 divisors, whose sum is σ = 108121998. Its totient is φ = 108121996.

The previous prime is 108121991. The next prime is 108122039. The reversal of 108121997 is 799121801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64416676 + 43705321 = 8026^2 + 6611^2 .

It is an emirp because it is prime and its reverse (799121801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108121997 - 2⁶ = 108121933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 108121997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108121991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54060998 + 54060999.

It is an arithmetic number, because the mean of its divisors is an integer number (54060999).

Almost surely, 2^108121997 is an apocalyptic number.

It is an amenable number.

108121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

108121997 is an equidigital number, since it uses as much as digits as its factorization.

108121997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 108121997 is about 10398.1727721749. The cubic root of 108121997 is about 476.3995612321.

The spelling of 108121997 in words is "one hundred eight million, one hundred twenty-one thousand, nine hundred ninety-seven".