108915997 has 2 divisors, whose sum is σ = 108915998. Its totient is φ = 108915996.

The previous prime is 108915979. The next prime is 108916019. The reversal of 108915997 is 799519801.

It is a happy number.

Together with previous prime (108915979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108388921 + 527076 = 10411^2 + 726^2 .

It is an emirp because it is prime and its reverse (799519801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108915997 - 2¹¹ = 108913949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 108915997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108915907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54457998 + 54457999.

It is an arithmetic number, because the mean of its divisors is an integer number (54457999).

Almost surely, 2^108915997 is an apocalyptic number.

It is an amenable number.

108915997 is a deficient number, since it is larger than the sum of its proper divisors (1).

108915997 is an equidigital number, since it uses as much as digits as its factorization.

108915997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 49.

The square root of 108915997 is about 10436.2827194361. The cubic root of 108915997 is about 477.5628739518.

The spelling of 108915997 in words is "one hundred eight million, nine hundred fifteen thousand, nine hundred ninety-seven".